विवरण
Aaj hum jo smartphone use karte hain, uska sabse important hissa hota hai — SIM Card.
Is chhoti si chip ko invent kiya tha Roland Moreno ne, 1974 mein.
1991 ke GSM network se lekar aaj ke 5G tak, SIM ne mobile duniya ko possible banaya.
Sach ye hai —
SIM ke bina phone sirf camera aur screen reh jaata hai!