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 ...

You might be ready to leave T-Mobile and its Magenta network in your rearview mirror. However, that doesn’t mean you have to give up the phone you bought from the carrier. In fact, it might save you a ...

Your phone's SIM card allows the device to make calls, send texts, and connect to the internet. The SIM card provides a phone number that identifies your device on the carrier's network, whether it's ...