Some Necessary Information about Mobile Technology

CSD    →        CircuitSwitched Data

GPRS →        General Pocket Radio Service

GSM   →        Global System for Mobile Communication

IMSI   →        InternationalMobile Subscriber Identity

ISD     →        InternationalSubscriber Dialing

MCC   →        Mobile Country codes

MMS   →        MultimediaMessaging Service

PIN     →        PersonalIdentification Number

PUK    →        PersonalUnlocking Code

SIM     →       Subscriber Identity Module

SMS    →        ShortMessage Service