If you’ve ever bought a second-hand iPhone or switched to a new carrier, you may have faced the frustration of a locked device. Carrier-locked iPhones prevent you from using SIM cards from other ...

You can check to see if your iPhone is unlocked from a carrier using any of a few different methods.

You'll need your iPhone's IMEI number if you want to unlock it and use it on a different cellular provider.

ZDNET's key takeaways Use these codes to forward calls, pay your bill, check balances, etc.Some of the codes work only on certain carriers or devices.One of the codes also might erase your data, so ...

Major cellular carriers — Verizon, AT&T, T-Mobile, Sprint, and others — typically lock their networks to the iPhone you buy from their stores or pay for via an installment plan. What does that really ...

If you’re thinking of moving to a new network, and want to keep hold of the same iPhone, you may hit a snag: the device is locked to your current carrier and can’t be used with any other company.

Jason Cipriani is based out of beautiful Colorado and has been covering mobile technology news and reviewing the latest gadgets for the last six years. His work can also be found on sister site CNET ...

Now that you’ve finally paid your phone off, Apple went ahead and announced another new iPhone. This means you’ll be upgrading, so you may be thinking about selling your existing phone to put towards ...

You could access numerous useful iPhone features by typing in a few secret codes on your device. Lots of the codes work whether you have an old or new iPhone and they can let you do things like ...