If you mean the telephone number attached to a certain SIM, you can put it into a phone and call another number - of your friend or something. The tel. no. could be written on your bill, or on the SIM's envelope. You could call the operator's public relations, tell them the serial no. written on the SIM and ask for the tel. no.. They may ask you about your identity...
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There are over 8 ways to find your IMEI number whether you are using a mobile or a tablet. The most simple one is to dial *#06#. Below url will guide you to more even if you have lost your mobile phone.