SIM card from old phone won't work in new phone

The SIM card from my old Cingular phone won't work when I insert it into my Sony Ericsson P990i. The Sony phone is unlocked. Do I need a special kind of SIM card? I am not very technical so this may be a silly question.

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91 Answers

How old is your current SIM-card ? There was a change in operating-voltage on the SIM-cards and its a known issue that the P990i wont accept "older" cards. Contact your provider and get a newer card. You could perhaps try one of your friends SIM-cards in your phone, before ordering a new one, if the card is newer than the one you have.

Posted on Oct 05, 2007

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