puk card

... the GSM standard. What is a SIM card? The SIM (Subscriber Identity Module) card also known as a "smart chip" is ... (internet connection standards). SIM cards are the size of a credit card but ... on a particular GSM network. SIM cards are usually available prepaid or on a contractual basis. Is this (SIM card) like a calling card? Not really. ... cannot receive a call with a calling card. Calling cards are a bit risky and

... what is GSM, what are sim-card, locked cell phone, PIN and PUK