A subscriber identity module is a removable smart card for mobile phones. SIM cards store the required information to identify the mobile device. It also contains data required for voice ...

A multi-carrier GSM phone with two, three or four SIM cards. Dual-SIM phones are popular with global travelers who use local and foreign carriers as well as people who want a business and personal ...

(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 ...

Any phone that your SIM card is placed into can access that network ... With LTE being built off of GSM and HSPA standards, ...

the practice of moving SIM cards to new phones from previous devices means that even users of newer devices may be vulnerable. Mobile operators and the GSM Association (which creates the standards ...