What is a sim card????.?

Question

What does it do and can you use it on a pay as you go phone? what is it for?

Answer 1

SIM cards are small smart cards that fit inside phones based on the GSM technology. SIMs contain personalized information about its user including the network activation and even phone book entries. One can put its SIM card in another GSM phone and use it as if it was his own phone.

Alternate Spellings: SIM stands for &Subscriber Identification Module

and the sim card u should be able to.