Look Up Sim Card Number
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At&t Sim Card Lookup
Click I know my number, enter your mobile number and press OK. Click Mobile phone lost or stolen? PUK or PIN code lost? Click PUK code lost. Depending on what is requested, enter your customer number or SIM card number and click OK. You will find your customer number on your bill and your SIM card number on the SIM card in your device. Look on the SIM card holder you received in your welcome letter. If there are 2 PUK codes mentioned, always use PUK1. Note: Don’t confuse the PIN code of your SIM card with the entry code of your mobile.
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