We know you’ve got questions, and if you’re brave enough to ask the world for answers, here’s the outlet to do so. This week’s Ask Engadget question is coming to us from Roland, who can’t wait to get his recently relocated sister some sort of phone with Skype capabilities.

“My sister recently moved to Belgium. She has access to WiFi at home, so I’d like to send her a mobile phone that can run a Skype client. Requirements are WiFi, can work on Belgian / European carriers, runs Skype, and has excellent battery life. Anyone have any suggestions?”

There’s nothing worse than not being able to communicate with someone when you desperately need to, so we’re hoping that our readers across the pond will be able to chime in here with a little advice. If you’ve got something productive to add, drop it down in comments below!

Ask Engadget: Best Skype phone for Europe? originally appeared on Engadget on Thu, 31 Dec 2009 23:05:00 EST. Please see our terms for use of feeds.

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We asked Maximum PC’s Will Smith to describe the cheapest PC you can build, and he said he’d do it, if only to talk you out of spending so little. Here’s what you gain, and lose, by going ultra cheap.

Over at Maximum PC, we just posted a guide that show’s you everything you need to know to build the cheapest PC I’d recommend to anyone for use as his or her main PC. It’s a surprisingly beefy machine, capable of playing games, ripping DVDs, editing video and photos, and playing 1080p video with nary a dropped frame. For a mere $647, we managed to pack a quad-core CPU, a great video card, 4GB of memory, and Windows 7 Home Premium into a surprisingly fashionable mid-tower. However, if you don’t need as well-rounded a general purpose PC, you can go cheaper, especially if you’re willing to make some sacrifices. Let’s take a look at the parts we used, and then we’ll start making cuts.

Let’s look at the price chart. If you’re not a gamer and aren’t using one of the handful of applications that’s accelerated by general-purpose GPU-based computing, then there’s no good reason to spend 25% of your budget on a videocard that will lie fallow for most everything you do. The Gigabyte motherboard sports integrated graphics that will do everything you need to do, including hardware accelerated decode for video playback. Pulling the videocard brings our total cost down below $500, to $481. Not too shabby, but we can save even more.

If you’re not going to be running tons of apps, editing photos, or encoding videos, that quad-core is massive overkill. To save a few bucks, we’re going to replace that quad-core Athlon II with a single-core Sempron LE-1250. It costs less than a Blu-ray disc at Best Buy, a mere $32. Unfortunately, that still doesn’t get us below $400, so we need to dig deeper.

Since you ditched the quad core CPU, your PC won’t be up to running many applications at once, so we can cut back on memory. You can buy a generic 1GB stick for $22 at Newegg, which is the minimum requirement for Windows 7.

Since you won’t be creating content, there’s absolutely no reason to spend big bucks on a massive 500GB hard drive. In fact, you could probably even get by installing Windows on a decent-sized flash drive, but that’s more expensive than what we have in mind. It’s tough to beat a more-than-adequate 80GB drive for a mere $35. Oh, and while we’re at it, you should ditch the optical drive. Odds are, you won’t need it for anything after you set up your machine, and it’s easier and faster to install Windows from thumbdrive (which you probably already have anyway).

After more than halving the price of our PC, Windows is looking mighty expensive. At $105, the OEM edition of Windows Home Premium is more than a third of the total cost of this machine. It’s time to start thinking about Ubuntu, which will get our total price down to a cool $200. But wait, we can go even cheaper.

If you’re just going to browse the web on this machine, why spend money on a real CPU? A Foxconn Atom motherboard that comes with the CPU costs a few bucks less than our AMD motherboard alone, so it’s time to trim the fat, yet again. Sure, we could spend a few bucks more and get the same CPU in a motherboard equipped with Nvidia’s Ion chipset, but EVERYTHING MUST GO!

For a machine with power requirements this meager, there’s absolutely no reason to spend 20% of our budget on a quality power supply. Instead, let’s get a case that includes an integrated power supply. It may not be reliable, but it sure is cheap!

Now, I’m reasonably certain that there’s no way to build a cheaper machine. The only bad news? You just built a nettop.

Don’t forget to check out Will’s complete guide to the cheapest PC he’d actually recommend you to build.

Will Smith is the Editor-in-Chief of Maximum PC and has been building PCs longer than he cares to admit. He enjoys long walks, Rock Band, and is anxiously awaiting the first great Android Phone and the Apple Tablet.

Top image by Tim Rogers/Flickr, used under CC License

David Quinlan is a normal guy with day job and just a bit of coding experience. But he and a friend lived the dream and cranked out a simple iPhone app in a weekend. Here’s how they did it:

“Thai, salad or ramen?” It’s lunchtime on a typical Thursday and it strikes us that millions of people all over the world are pondering the same question. This question is our launchpad, making us part of the thousands of people who wanted to build an iPhone app for “that.”

I’m a product and marketing guy with some design and coding skills. Roy is a developer with some business savvy. Combined, we make a great team and complement each other’s skills well, but we only started working with Objective-C last year, like many others who are trying out iPhone development. We’ve already built an app or two, so we’re familiar with the language and frameworks. However, as with all new projects, you usually have to do a little research to understand how to approach the different challenges…especially in a world defined by 320×480 pixels.

For the longest time, we’ve played around with the idea of creating an app for fun. After discarding a couple of good ideas (because they were too complicated or a quick search in the App Store showed that someone else already does it well), lunchtime lands us on a simple, fun idea to help people stuck between decisions.

But while most people want to create a great iPhone app, my friend and I go one step further, making a pact to finish the project within a weekend—or realistically, our app would never get completed.

On a piece of paper, we scribble out two-three wireframes and developed an outline for some basic screens. We decide on an app that offers up to three multiple choices. You can write your own answers—for example, Thai, salad or ramen—and you simply pick a randomized choice to see the answer to your decision. We decide to use playing cards as the theme. Immediately, we circle the “must have” features (first priority), then the “like to have” features (last priority), and finally the features that needed more investigating. We leave lunch on Thursday with a little homework and a plan to get together on Saturday.

My homework includes determining the look, feel and interaction on each screen. Roy needs to research some of the Xcode features we haven’t had a chance to play with yet in our “real” jobs, mainly animations and randomization.

On Saturday morning, we meet at a local coffee shop that had free Wi-Fi, claim a large table so we can sit side-by-side and grab the first of many large cups of coffee. Then we create a shared Dropbox folder for this project—a Basic account is free and comes with 2GB of storage. The Dropbox is important because it allows us to multitask on the same project with any/all changes synchronizing in real time. For larger projects, you may want to consider GitHub.

We pull up a more detailed outline of what we want to accomplish for our app as well as basic wireframes. Given that we only have a weekend to complete this app, we decide to focus only on the “must have” features. A developer can always issue feature updates at a later date to include the “nice to have” features.

Going screen-by-screen, we detail the elements on the page, style treatments, layout, timing, etc. We also discuss what Roy learned about animating the card’s flip motion, since this was one of the core functionality of the app. We briefly review the Quartz 2D and Core Animation libraries, since we had not previously done any work with those. We even discuss using a UIWebView to render the animation within WebKit’s CSS. Ultimately, we find a simple solution using standard UIViews and UIButtons. The UIView class has some animation class methods, and one of the built in transitions is a flip effect. As for the randomization, we knew most languages provide a random function, and Objective-C is no exception. For purposes of this app, all we wanted was a simple method to randomize an array. Roy found a couple of examples of this, but one that stood out was over at Dr. Touch’s website. He describes an approach with which to implement a class extension method so you can easily shuffle any array.

We dive into our respective MacBook Pros with a Borg-like focus on our individual areas of expertise. I open up Photoshop and began building screens. The first screen is the default image. This is the very first screen people see when the app starts and begins loading. Apps can be built in either portrait or landscape view. If you choose to build your app in landscape view like ours, you still need to create a default image that displays in portrait view. Simply create your landscape view and rotate clockwise or counter-clockwise (depending on whether you want left or right landscape view). Now the default image loads in portrait view but since your images is rotated, the user will twist the iPhone to landscape view.

I then spend the next couple of hours creating comps, background images, buttons, card (front and back) and info page. I also spend some time focusing on the app icon. This is obviously the “face” of your app—a badge of honor—so you’ll want to put careful thought into the icon imagery. Remember, you’ll need the icon in both the 57×57 and 512×512 sizes. Once completed, I upload it to Dropbox so that Roy could start using the creative elements.

By the time I glance back to Roy’s laptop, he’s created a new Xcode project and is already playing around with code to animate green boxes that flip on a click. While he’s working on the prototype in the iPhone Simulator, I grab the info.plist file and edit some of the settings – remove status bar, app display name, remove gloss from icon, etc. We then decide it’s time for us to add some real images to our prototype. We put in the background image, the front and back of the cards and the navigation buttons. The positioning is off (by a lot) but the cards look good and it’s flipping smoothly. We do some bad math, but eventually get the exact spacing and positioning that we want for each card. We play around with the timing of the flip, set the on/off states for the navigation button and now it’s feeling pretty good.

Seeing the pieces come together in the app shows me that there are a couple of images that needs fine tuning. I make changes as Roy begins working on the customizing screen and info screen. The customize screen is the place that allows people to type in whatever they want to show on the face of the card. We limit it to 25 characters… anything more than that and it writes over/outside of the card. We talk through this screen a bit more in detail. The interaction in each field, how the keyboard acts, and how we save before going back to the cards. We spend a bit of time in Interface Builder wiring up exactly how we want this page to look and act. The info page is completely optional, but we like to have it because it includes additional ways to reach us.

Wow, seven hours and fours large coffees later, we have a lot done, but there’s still lots more to go. What we have now is an app that fires up; displays a default loading screen; gets people to a screen that shows three cards (back of the card showing); they can select any/all of the cards and the cards flips to show the front of the card; they can click on a button labeled “Try Again” to reset the cards; they can click on a button labeled “Customize” that opens a new screen; the “Customize” screen allows you to enter text into 3 separate fields with a max of 25 characters in each field; and you can get to the Info screen. We spend the last hour of the day together cleaning up code and discussing what we have left to accomplish tomorrow.

On Sunday, we meet at another coffee shop with free Wi-Fi. Coffee first. We feel like we’re about 80 percent done before we start working again. The major work left for the day ahead is saving the custom text, displaying the custom text on the face of the card, and randomizing the text. We had additional functionality ideas, but we kept ourselves honest, and kept the scope creep to a minimum. One example of this was the method for storing/saving the custom text on each of the three cards. Roy could have created a sqlite database or used Core Data, but the easiest approach was to just use the built in standardUserDefaults object found in the NSUserDefaults class. Using this method stores the values to the app’s settings just fine for our needs and saves us a lot of time.

While Roy is working on those items, it’s a perfect opportunity for me to prepare some of the things we’ll need later that day. When you submit an app to the App Store, it’s not a simple upload of a file. Apple requires the following information for every app submission: Application Name, Application Description, Device Requirements, Primary and Secondary Category, Subcategories, Copyright, App Rating, Keywords, SKU Number, Application URL, Screen shots, Marketing Description, Support URL, Support Email Address, End User License Agreement, and Pricing / Availability.

So, I prep all the app submission information while Roy is busy coding away, first searching the App Store for similar apps and their names. We like “Stuck?” and luckily no one else is using it, so we go with that name. I create the app description, add some keywords, set the price and determine where we want to sell this app (just in the USA, certain countries or worldwide). Then I register a domain name (stuckapp.com) to be used for the application URL/support URL and linked it to a newly created Tumblr account. I also created the required support email address. The other items you’ll want to prepare in advance are: screenshots (up to five), a large icon (512×512) and, if this is your first time submitting an app, any certificates/provisioning profiles.

Things tend to take longer than you expect, and even though we’re basically finished with the app by early Sunday afternoon, we still spend a couple of more hours tweaking it and preparing everything for the App Store submission—cleaning code and fine tuning as we go along. We spend the majority of the day on one computer pushing pixels, formatting, and ensuring the timing and user interaction was exactly as we both wanted. After almost five hours of work on Sunday, we have the app that we both envisioned. We begin testing in the iPhone simulator and then on devices (both iPhone and iPod touch) for stability and functionality. Again, being a simple app, it was easy and quick to test.

After proving its stability, we decide to publish Stuck? to the App Store. My first attempt at publishing another app by myself took two days—attempt, fail, Google, attempt, fail, Google more, etc.—until it finally worked. But the second time around was much easier and faster. We copy/paste all the text prepared earlier and then added the screenshots and images. All in all, we have our app uploaded in about 15 minutes. At this point, we’re excited, hungry and tired, but also quite proud that we completed a solid app over a weekend in a coffee shop.

We had our fingers crossed that the App Store would approve our app. And, as amazed as we were that we could finish an app over the weekend, the real surprise came after we submitted to the App Store. We submitted the app on Sunday evening. It changed status from Waiting for Review‚ to In Review, on Monday. On Tuesday, we received an email informing us that our app was Ready for Sale. Approved in two days! That has to be a record‚ especially before the holidays.

Especially after talking about building an app together for so long, like so many people reading this article, I must say, the fulfillment is immense. We finally did it.

TIPS FOR COMPLETING AN APP OVER A WEEKEND

1. You can’t do it yourself. You can, but you wouldn’t want to. Ideally, you want to partner with someone with a different, complementary set of skills. Partner with someone who knows and respects your area of expertise, but is even more confident and knowledgeable about their own skills. Good communication is implied in an effort such as this so you’ll go through periods of rapid fire questions bouncing ideas off each other and then periods of silence as you work on separate tasks. There’s a lot to get done and multitasking will be key.

2. Multitask. As suggested above, working with someone who complements your own skills allows you to multitask. What do I mean? For example, in the beginning, once you scratch out a wireframe of an idea, one person can begin coding – putting placeholder buttons and blocks into place. At the same time, the other person can create comps and then cut out each element to use when they get to the right stage. Also, at the tail end of the project, one person can wrap up the project and clean the code while the other prepares all the images and marketing copy for the App Store submission process.

3. Do at least one thing well. Unlike most desktop applications or web project, you have to remember that most good mobile apps fulfill a need that can come anywhere, any time. Your app idea doesn’t have to be complicated, but good apps seem to do one or more of these things well:
– Solves a problem; – Is entertaining; – Serves a specific niche; – Engages the user; and/or – Takes advantage of the unique features of the iPhone.

4. Set goals and milestones. Whether your goal is speed to market, just to gain experience, or to build the best damn app that does (blank), clearly state your goals. Initially, it will help you focus on the areas that are important/critical for success. It will also help you later down the road as you face hard decisions about “must-have” features and “like-to-have” features. Remember, you can always issue feature updates so focus on the “must-have” items and do whatever is necessary to meet that goal.

5. Get a Dropbox account. For small- to medium-sized projects, you cannot beat Dropbox. It allows you to store, share and synchronize files with others. Stop sharing files back and forth on your USB memory stick. Get a Dropbox account and share files in real time. We abused the hell out of our free, shared Dropbox folder and it worked flawlessly. For larger projects, you might want to give GitHub a try.

6. Test. Test. Test. When you see the finish line, it’s easy to gloss over the important step of testing your app. Test in your iPhone simulator, but also try to get your hands on an iPod touch and of course on an iPhone as well. Depending on the complexity of your app, you might want to create a test plan to make sure all the use cases and functional tasks are covered. The last thing you want is to have an app in the App Store that crashes or doesn’t work as expected. You may never recover from all the ego-shattering feedback.

7. Understand the App Store submission process. Apple provides a PDF document detailing to submission process. But that document is only available for registered developers. If you’ve already registered, read that document thoroughly before you begin the upload process. It will give you a good idea of what’s involved, but also what you’ll need to prepare in advance. Apple also provides some good tips for app store submission and approval .

Thanks to David Quinlan for sharing his story and advice with us. If his narrative has compelled you to try out Stuck?, it’s $1 at the App Store. And, of course, share war stories of your own long weekends writing apps in the comments. [Stuck]

After the crotchbomb there has been a lot of noise about airplane security again—you can see how stupid the leaked new flight rules are here. But what’s the actual risk of an airplane attack? Here’s the definitive chart:

As you can see, the chances are very slim. As slim as the chances of the new security rules having any real effect in preventing any new attacks, sadly.

[Data collected by Nate Silver]

One of the most persistent myths about Windows is that you need to reinstall the operating system regularly to keep it running at top performance. Let’s take a look at the real problem and how to fix it.

Today we’re talking about the myth that Windows slows down over time, and how to solve the problem. The reality is that Windows doesn’t slow down if you just take care of your PC a little more. Follow these procedures, and you won’t have to wonder if spending hours backing up data, installing from disc, and re-installing your essential applications is really necessary.

What Does Slow Windows Down Over Time?

I’m not going to sit here and tell you that your Windows PC will never slow down—because for many people, they almost always do. What actually slows your PC down are too many poorly written applications that stay resident in memory and waste CPU cycles, having too many badly written low-level applications that hook into Windows, or running more than one antivirus application at a time. And of course, if you’ve run your PC’s hard drive out of space, you can hardly blame Windows for that.

If you aren’t getting the picture, the problem is usually the person behind the keyboard that installed too many junk applications in the first place. More gently put, it’s often that (very well-meaning) person’s gradual easing of their safeguards and cleaning regimens as time goes by.

Stop Installing Junk Applications

Installing software should be thought of like feeding your PC. If you constantly feed your PC garbage apps, it’s going to get sick and won’t be able to run fast anymore. These poorly written applications clutter your drive with unnecessary DLL files, add always-resident Windows services when they don’t need to, bloat up your registry, and add useless icons to your system tray that waste even more memory and CPU cycles. Usually you can get away with using a few terrible applications, but as you continue to install more and more of them, your PC will slow down to a crawl.

Be Smarter About What You Do Install

We feature and recommend a lot of software applications around here, but you should keep in mind that we aren’t trying to tell you to install every single one of them at the same time-just install the applications that you actually need and you’ll generally prevent the dreaded format and reinstall.

Here’s a few tips to help you know what applications you should be careful with:

• Apps that function as an Explorer plug-in, because they directly hook into the shell and any problem will make your entire PC slow or in the worst case, crash repeatedly.
• Antivirus applications are notorious for slowing your PC down, and you should never, ever, ever use more than one real-time antivirus application at a time. We recommend Microsoft Security Essentials as a free, fast, and awesome antivirus tool.
• Anything that says it will “Speed Up Your PC” or “Optimize Your RAM” will most likely slow it down, or best case, do nothing at all. Avoid these like the plague.
• Make sure to install official system drivers from the manufacturer website. Drivers have a huge impact on performance, and you want to have stable, updated drivers.
• Registry cleaners are a mixed bag, and really aren’t going to speed up your PC in most cases. The biggest problem, however, is that too many of the commercial registry cleaners set themselves to run at startup in the system tray, wasting your memory and CPU cycles.
• You should strongly consider the idea of using portable applications wherever possible, since their self-contained nature means they won’t clutter up the rest of your PC with things you don’t need.

Keep Your Computer Clean and Trim

Once you’ve rid yourself of your junk application habit and resolved to only use healthy, useful applications, you’ll want to make sure to keep your PC clean of any remaining clutter that doesn’t need to be there. You can set up a shortcut to manually run CCleaner silently with the push of a button, but your best bet is to set up CCleaner to run automatically on a schedule, so you don’t have to remember to do it.

Since CCleaner is only going to clean up temporary files, you’ll still need a good solution for keeping the rest of your PC clean-and Lifehacker’s own Belvedere can help you automate your self-cleaning PC or automatically clean up your download folder.

With all of this automated file deletion going on, your hard drive is likely to get a bit fragmented. If you’re already running Windows 7 or Vista, automatic defrag comes out of the box and probably shouldn’t be messed with, but Windows XP users will need to use Windows Tasks to setup a schedule and automatically defrag their drives.

Use a Virtual Machine or Sandbox to Test Software

If you still want to test out all of the latest software, including apps that look a bit rough around the edges, your best bet is to use a virtual machine to test out anything before putting it onto your primary operating system. You can install all of your software in an XP or Windows 7 VM just like it was a real PC, and with the latest VMWare player releases, you can even enable Windows Aero in a guest VM. If you are new to the idea and need some more help, you should check out our beginner’s guide to creating virtual machines in VirtualBox, or Windows 7 users can check out our guide to using XP Mode. If you don’t want to go the virtual machine route, Windows XP and Vista users can alternatively use Windows SteadyState to protect their PC and roll back all of the changes on a reboot.

So what about you? Do you always take the reinstall route, or have you devised your own best maintenance practices? Share your experience in the comments.

The How-To Geek reinstalls Windows only every few years and has no speed problems at all. His geeky articles can be found daily here on Lifehacker, How-To Geek, and Twitter.