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

Changing physical SIM cards on your phone is always a fiddly business. First, you have to root for the little SIM tray tool ...

These two ways of connecting your phone to a cellular network are very different. We tell you about each and how you can switch from one to another. I started my career with CNET all the way back in ...