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On the main screen type
*#06# for checking the IMEI
*#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.
#pw+1234567890+1# Shows if sim have restrictions.
*#92702689# - takes you to a secret menu where you may find some of the
1. Displays Serial Number.
2. Displays the Month and Year of Manufacture
3. Displays (if there) the date where the phone was purchased
4. Displays the date of the last repair - if found (0000)
5. Shows life timer of phone (time passes since last start)
*#3370# - Enhanced Full Rate Code (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
*#3370* - (EFR) deactivation. Phone will automatically restart. Increase
battery life by 30% because phone receives less signal from network.
*#4720# - Half Rate Code activation.
*#4720* - Half Rate Code deactivation. The phone will automatically
Inactive sim is usually related to your SIM Card, you should try reinserting
your SIM card again, to see if it works, or simply insert your current
SIM card into another phone to check if there is any service. should
both failed. It should be your SIM card problem, you can contact your
service provider or carrier to have a replacement SIM.
This is a known design flaw with the w760i - it occurs when the phone requests info from the SIM (building contact list etc.) and the SIM connection is lost. This would happen on any phone but the w760i has a shock protection design issue whereby closing the slide quickly causes the SIM to disconnect. You should be able to replicate the issue by turning the phone on and slamming the slider shut as soon as the phone shows your network name. Leave the phone on for a bit and you will feel the phone buzz and 'Inactive SIM' will display, the phone will then reboot.