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 ...

The subscriber identity module -- SIM -- contains the information used to connect to your wireless carrier's network from your iPhone 4. If you are planning to resell your company's iPhones, you ...

The newer eSIM technology, which is quickly becoming the standard on high-end phones, is safer and more convenient.