Take the phone back, you cannot get it to work if the sim is not registered.
either call AT&T or you have to go to an AT&T store to activate it. If they can't, then you should buy a new SIM card
YOU CAN'T NIGGY! if it says ''unregistered sim'' that means either getta new phone eerr getta new sim!
You call your carrier and activate your sim card.
The plural form of SIM card is SIM cards.
sim card
sim card
Yes, it's possible but very difficult. On a GSM network when a call is initiated, information contained in the sim card is relayed to the tower, but in addition, so is the phones IMEI number. (ESN Number for CDMA based networks) The SIM card and IMEI number are tracked together by the towers, so a record does exist.
A SIM card adaptor will allow you to use a micro SIM in a standard SIM slot.
yes
NO
The sim card.