After you purchase and use your cellphone for an extended period of time, you can change networks. However, the phone that you're currently using may not be offered on that network. If you wish to ...

If you have a SIM card PIN enabled on your phone to access data on the SIM card, but you repeatedly enter it incorrectly, the SIM card may lock you out from further attempts. You can reset the SIM ...

In this guide we’ll show you how to SIM unlock the Galaxy S9 so you can use it on different carrier networks. That way if you bought the Galaxy S9+ from AT&T, you can still take it to T-Mobile if you ...

To check if your Android phone is unlocked, try swapping in another SIM card or test your network settings. If calls work, ...

One of the promoted specifications on the new Apple iPhone 4S is the "world phone" capability, but it isn't quite the world phone that many international travelers who use GSM phones are used too.

[Jason Gin] wanted to reuse the SIM card that came with a ZTE WF721 wireless terminal he got from AT&T, but as he expected, it was locked to the device. Unfortunately, the terminal has no function to ...

If you've just got your hands on a shiny new Sim card, congratulations. Switching your Sim (the chip that dictates your allowance) can unlock huge savings. Now comes the crucial step of activating it ...

The big reason to immediately update to the November security patch – besides being the first one for the Pixel 7 – is that it contains a bug fix for a security issue that can unlock and bypass your ...