SIM Card

SIM - Subscriber Identity Module

SIM cards are always used on GSM phones. GSM phones are unlocked phones

Technical definition for SIM -  A subscriber identity module or subscriber identification module (SIM) is an integrated circuit that is intended to securely store the international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephony devices (such as mobile phones and computers)

The Mobile operator or the carrier assigns and maps mobile number to this SIM.

Your mobile number is unique identification number for  you to communicate with the rest of the world.

There are 3 basic types used presently: Mini, Micro and Nano

 
Mini SIM cards were used in most of the mobile phones. New mobile phones uses Micro SIM cards. Apple has started using Nano SIM in its few models. Micro SIM is smaller than Mini SIM. Nano SIM is smaller than Micro SIM.

While checking the Mobile product description, it is essential to note down the SIM type mentioned in the description. If your old mobile SIM is not compatible with the new one, you may have to contact the customer care of the SIM card to replace with the new mobile SIM card type.

There is no SIM card for a carrier phone or CDMA phone as it is locked for a carrier or mobile operator. Some CDMA phones comes with SIM slot for 4G / LTE network Connectivity and even some CDMA mobile comes with additional GSM SIM slots.

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