What is meaning of SIM

Aapko Mobile Use Karty Huye Kafi Arsa Hogaya Hoga.

Aur Ye Bhi Pata Hoga K Mobile Main SIM Lagti Hai.

To Kya Aap Ye Bata Sakty Hain K SIM Ki Abbreviation Kya Hai?

S = Subscriber
I = Identity
M = Module