Your phone's SIM card allows the device to make calls, send texts, and connect to the internet. The SIM card provides a phone ...

The new Samsung Galaxy Note 5 requires a nano SIM card for you to place calls, access the Internet, download applications, and share photos over your network service ...

(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 ...

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