Nokia shortcuts

*#06# for checking the IMEI
(International Mobile Equipment Identity).

*#7780# reset to factory settings.

*#67705646# This will clear the LCD display (operator logo).

*#0000# To view software version.

*#2820# Bluetooth device address.

*#746025625# Sim clock allowed status.

*#62209526# – Display the MAC address of the WLAN adapter.
This is available only in the newer devices that support WLAN

#pw+1234567890+1# Shows if sim have restrictions.

*#92702689# – takes you to a secret menu where you
may find some of the information below:

*#3370# – Enhanced Full Rate Codec (EFR) activation.
Increase signal strength, better signal reception.
It also help if u want to use GPRS and the service is
not responding or too slow.
Phone battery will drain faster though.

*#3370* – (EFR) deactivation. Phone will automatically restart.
Increase battery life by 30% because phone receives
less signal from network.

*#4720# – Half Rate Codec activation.

*#4720* – Half Rate Codec deactivation. The phone will automatically restart