An unlocked iPhone means it can use any cellular network, so long as you have a compatible carrier SIM card. Due to this, unlocked iPhones are more valuable and highly desired for both local and international users, because it allows you to use any GSM carrier whether at home or abroad just by swapping out SIM cards. But how do you know if an iPhone is unlocked or not? You usually can’t tell just by looking at it, but we’ll show you how to find out if the device is factory unlocked or not using one of three methods. If you plan on doing some international travel, you’ll want to check before you leave. Similarly, if you plan on buying or selling an iPhone, you’ll want to check if its unlocked or not before completing the transaction.

First, here are a few safe assumptions: if an iPhone was bought on contract, it will probably remain locked to that carrier. Exceptions to this are if an iPhone has been manually unlocked by a provider (many CDMA carriers will unlock the SIM card slot on iPhone models even while in contract, you just have to ask), or if an iPhone has ended its contract and the device has been unlocked per request, such as you can do with AT&T. On the other hand, if you know that the iPhone was bought unlocked from Apple by paying full price, then you don’t need to do anything other than swap in whatever carrier SIM card you want to use.

Let’s get on with three easy ways to check the unlock status of any iPhone:
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Wondering what is in that zip file or archive you downloaded, but you don’t want to extract it to find out? Maybe you are hunting around in a see of archives for a specific file you zipped up a while ago, but you’re not quite sure which archive contains it? You can easily peer into zips and other archive formats to view their contents without actually unzipping or uncompressing them, which is an excellent way to check if a particular archive has a file or folder you are looking for, and to make sure you downloaded the proper file.

There are a few easy ways to view zip contents on a Mac and we’ll cover three of them, two of which are zip-centric command line based and built into all versions of OS X (and many other unix and linux variations for that matter), and another approach which uses a free third party utility and Quick Look to be able to quickly glance at any archives contents.
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Setting up a dual-boot environment for OS X Mavericks and OS X 10.8 (or even 10.7 and 10.6 if you’re still running an older version of Mac OS X) is easy and allows for a fresh installation of Mavericks to test and develop with. Because the original OS X installation remains untouched, it’s also the safest way to give Mavericks a trial run, which is perfect for running the Developer Previews or if you’re just not sure you’re ready to run OS X 10.9 full time yet.

You don’t need another hard drive to be able to do this, instead you utilize unused space on the existing drive to create a new partition that runs the alternate OS. This process can be completed from a Mavericks boot drive if desired, and using such an USB installer tends to prevent any potential errors with Disk Utility (more on common errors you may encounter at the very bottom of this article), but it is not necessary.
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For those of us who use several different types of network connections to get online, you may want to take a moment to set the networking service priority in OS X. This insures that a Mac isn’t connecting through the wrong networking interface when multiple network services are available.

For example, if you have a Mac that is connected to an ethernet network, but also finds available wi-fi networks, you can set one of those to be the preferred connection type. This can also be used to prioritize connections through a VPN, and you can go a step further and set the priority on a per-location basis, which is perhaps the most useful way to use this trick.
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The visual change between iOS 7 and iOS 6 is obviously significant, and this graphic does a great job of showing just how the iOS home screen has evolved over time with the iPhone. Covering versions 1.0 through 7.0 and a time period of 2007 to 2013, it gives an interesting look into how things have changed in the past and how they are changing now:

Click here or on the image above for the full sized image

When set alongside each other like this the newest changes with 7 look less drastic, but certainly much brighter and more colorful than before. In some ways the iOS 7 home screen has more commonality with the original 1.0 through 3.0 releases than the more recent 4, 5, and 6 builds, at least in flatness and the Dock design. If you want to get a preview of what 7.0 will look like on your iPhone or iPod touch, load these iOS 7 preview videos and screen shots on your iOS device, they do a fairly good job of what to expect, at least with what we’re seeing in beta 1 and what is visible through Apple’s initial marketing materials.

Heads up to @applespotlight for retweeting this find

Disk Utility usually works trouble-free, but a frustrating “Couldn’t Unmount Disk” error can halt whatever the attempted task is right in its tracks. This can happen during partitioning, disk verification and repair, and even during formatting, and there’s usually little to no additional information provided as to how to resolve the problem or even what the problem is with regards to the error message or the app in Mac OS.

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The visually overhauled iOS 7 beta includes a handful of nice new default wallpapers, two of which are static (the left pink blue dots and galaxy image), and two are animated (the right two varieties of blue and purple vector bubbles). Obviously without iOS 7 you won’t be able to get the animated wallpapers, but you can get a static image of them and they still look pretty nice. These are all sized for the iPhone and iPod touch with 4″ displays at a 640×1136 resolution. They’ll look fine on the smaller 3.5″ displays too, but trying to size these up for an iPad or Mac just won’t look that great.

Save the full sized images below, or you can download them all in a convenient zip put together by CultOfMac.

Download all wallpapers in a zip

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Need to dial a vanity number from iPhone? You know, the phone numbers that are listed as letters rather than numbers? These phone numbers are mnemonic and listed as letters and are often called vanity numbers, typically they will be in a format like 1-800-COMCAST, 1-800-MY-APPLE, 1-800-SOS-APPLE, etc, and they are not always automatically detected by iPhone or iPad. At first glance they don’t appear to be usable on the iPhone, but it turns out they are, with a little trick.

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The designers at Teehan+Lax have built a complete iOS 7 GUI elements template, and are now offering it for free as a very functional PSD file. Everything is fully layered, well-labeled, and organized logically, making it an excellent tool to use for mocking up apps and concepts as they would appear natively in the completely redesigned iOS 7 interface.

Being a PSD it is obviously aimed at Photoshop, but it works perfectly fine in Pixelmator in our testing, and all layers remain intact (at least in Pixelmator 2.2).

• Get the iOS 7 elements PSD here from Teehan+Lax

Do note that because iOS 7 is currently in beta, some of the elements may change slightly from the beta release to the final release. We can expect Teehan+Lax to update the template file for any significant changes though. Happy designing.
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Fed up with iOS 7 beta and it’s quirky bugs? You can downgrade fairly easily, which is probably a good idea for most casual users who aren’t accustomed to handling beta OS releases in various stages of development, because it’s really not meant for everyday use on your primary device anyway. Yes, Apple’s developer notes attached to iOS 7 beta releases specifically say that any iPhone or iPod touch that upgrade to iOS 7 can not downgrade back to iOS 6, but that’s not actually true in practice. In fact, just like with prior beta versions of iOS, you can downgrade back to whatever the most recent stable iOS release is with relative simplicity, so ignore the dev portal message and get back to a stable version. It only takes a few moments, and it’s not much different than restoring iOS in general.

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Just like other recent major Mac updates, OS X Mavericks arrives as an app that wants to update the current OS X installation, and with a little work you can make a bootable USB installation drive. This allows you to easily perform partitioning for dual boot situations, clean installs, upgrades on multiple Macs, and more, plus it’s just really convenient to have for troubleshooting and simple future installations, without having to re-download OS X 10.9 every time you want to install it or perform an upgrade.

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Of course the best way to preview iOS 7 would be to install the beta, but let’s face it, that beta is buggy, incomplete, and besides, it requires a developer account to use, which makes it inaccessible to the vast majority of people. So what’s the next best thing to preview the new iOS without installing the beta? Viewing full-sized, full-screened videos and screen shots directly on your iPhone or iPod touch. This gives you an excellent idea of how iOS 7 will look on your device, and with the videos, it also gives a good preview of how certain aspects will behave. This goes far beyond just viewing feature screen shots and visual comparisons between iOS 7 and iOS 6, and it really is the next best thing to just installing the beta, but without the hassles.

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iOS 7 brings a significant user interface overhaul to Apple’s mobile devices, and though it’s best to be experienced and used first hand, screen shots can do a fair job of demonstrating the differences. If you’re not a developer and can’t use the beta releases yourself, then comparing iOS 7 to iOS 6 side-by-side can give an appreciation for the changes ahead, so we rounded up a few comparisons of the home screens, common apps and app interfaces like Notifications, Siri, Messages, Mail, multitasking, and Weather, and also a large side-by-side chart showing the differences between icons in both iOS versions. Take a look.
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Apple has yet to provide an official list of OS X 10.9 compatible Macs, but as we mentioned before regarding the first Mavericks Developer Preview, most Mac hardware that supports OS X Mountain Lion (10.8) should be able run OS X Mavericks (10.9) without any issue. This has been confirmed apparently by AppleInsider, who notes that Macs can even upgrade to Mavericks directly from OS X Snow Leopard 10.6.8 without having installed 10.7 or 10.8, assuming they meet the system requirements.
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OS X 10.9 Mavericks Developer Preview 1 is now available to download directly from Apple. Registered developers can access the installation from Apple’s Developer Center. Much like prior OS X betas, installation of OS X Mavericks is done through the Mac App Store, and it is highly recommended to back up OS X with Time Machine before beginning installation of any beta operating system.

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The first developer release of iOS 7 has arrived and is now available to download. iOS 7 beta 1 has a build number of 11A4372q, and can be installed onto any compatible iOS device, including iPhone 4, 4S, 5 and newer, iPad mini, and iPod touch 5th gen. Currently, iOS 7 beta does not yet support any iPad model, but that is expected to change in the coming weeks as Apple continues to create new image assets for the major interface overhaul for the larger screened iPad, which it will be compatible with for nearly all versions post 1st gen.

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OS X Mavericks (10.9) will be out later this year, but you don’t have to wait that long to get the sweet new wave wallpaper that will be the default desktop background on future Macs and OS X releases.

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Obviously iOS 7 looks incredible enough that virtually every single iPhone, iPad, and iPod owner on the planet is going to want to run the amazing new iOS on their devices… leading to the big question on everyones minds being, what devices does iOS 7 support? And what new features work on which device? The full lists are below, but it’s safe to assume that basically any semi-new iOS device has full support, though not all devices compatible with iOS 7 will get every single feature (like AirDrop).

Here is what we know so far, courtesy of Apple:
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