Q.Which mobile technology uses a removable SIM card to store the subscriber's identity?
(A) CDMA
(B) GSM
(C) WLL
(D) VoIP

Two mobile standards differ in how they identify the user — one uses a removable card, the other uses codes.

Section i compares mobile technologies. GSM (Global System for Mobile Communication) is the most widely used mobile standard and uses a small removable SIM (Subscriber Identity Module) card that stores the user's identity, so the SIM can be moved from one phone to another. So option (B) is correct. …

Do not swap GSM and CDMA. Remember: GSM = removable SIM card (the common standard); CDMA = unique codes on a shared frequ …