SIM – Subscriber Identity Module

The SIM is a tiny circuit embedded in a removable card. This contains the data that enables the device to register and connect to any network. This provides unique identity numbers for subscribers to get connected with other people and internet. 

SIM

There are few different types of SIM based on their technology used to connect and based on their size. GSM and CDMA uses different encryption type to make the connectivity. Different sizes have evolved for minimizing its size and shape.

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