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If your phone is displaying an "Invalid IMEI" or "Registration Failed" message, it is usually a sign of corrupted firmware rather than a need to change the number. In these cases, it is best to visit an authorized service center or use Airtel's repair guides to reload the stock operating system legally. Are you experiencing a specific network error lock issue that led you to look for an IMEI change? Codes for NOKIA 2690 - HardReset.info