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There are four formats of sim card i.e., full size, mini sim card, macro sim card and nano sim card. Started from full-size sim card, nowadays nano and macro sim cards are widely in use, depending upon the slot in different mobile phones.
Posted by Tradeindia user (08-06-2020)
Each sim card stores network state information that is received from LAI (location area identity). Operator networks have unique LAI number & when sim the device changes its location, it collects new LAI & sends it to the operator network.