Nokia Lumia 1520 User Manual page 107

If you forget the code and your phone is locked,
your phone will require service. Additional
charges may apply, and all the personal data on
your phone may be deleted.
For more information, contact Nokia Care or
your phone dealer.
IMEI This is used to identify phones in the network.
You may also need to give the number to Nokia
Care services.
To view your IMEI number, dial *#06#.
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