There are several things that you need to consider when getting an pre-owned iPhone. The most important factor for most people is if the device is carrier locked. If you plan on using the phone on a ...

(Subscriber Identity Module lock) A function in GSM cellphones that restricts the phone's use to a particular cellular carrier identified by a SIM card. SIM locks are used to ensure subscribers finish ...

Owners of used iDevices can now check the Activation Lock status to find out whether it's been wiped by the seller. Our team tests, rates, and reviews more than 1,500 products each year to help you ...