Type these when on the main screen, confirm like you confirm a phone number:
*#92702689# – opens a secret menu where this information can be found:
1. Serial Number,
2. Month and Year of Manufacture,
3. Date where the phone was purchased,
4. Date of the last repair,
5. Life timer of phone,
How to unlock service provider:
- Insert sim, turn on the phone, press-hold Volume Up for three seconds, press C after the pin code appears on-screen, press * and wait for a message to flash, press * once more and then type in 04*pin*pin*pin#
*#06# - check IMEI, International Mobile Equipment Identity,
*#7780# - reset phone to factory settings,
*#67705646# - clear the LCD display,
*#0000# - view software version,
*#2820# - show device's Bluetooth address,
*#746025625# - Sim clock allowed status.
*#62209526# – display WLAN adapter's MAC address,
*#21# - show the number that All Calls are diverted to,
*#30# - show the private number,
*#43# - check the Call Waiting status of the phone,
*#62# - show the number that the Divert If Unreachable (no service) calls are diverted to,
*#67# - show the number that On Busy Calls are diverted to,
*#67705646# - remove operator logo on 3310 & 3330,
*#73# - reset phone timers and game scores,
*#746025625# - display the SIM Clock status,
*#7780# - restore factory settings,
*#8110# - show software version,
*#92702689# - display phone's serial number, dates of production, purchase, repair and user transfer,
Press-holding # allows to switch between lines.
#pw+1234567890+1# - checks for Sim restrictions,
*#3370# – activate Enhanced Full Rate Codec (EFR), offering increase signal strength and better signal reception in return for increased battery drain,
*#3370* – deactivate (EFR), making the phone restart and increasing battery life significantly,
*#4720# – activate Half Rate Codec,
*#4720* – deactivate Half Rate Codec, making the phone reset,
*#7370925538# - show wallet code (this will erase the wallet data and require lock code. Code can be 12345, 1234, 0000 or 000000),
*#3925538# - delete the content and code of the wallet,
*#7328748263373738# - reset security code (12345 or 1234 or 0000 or 000000 by default),
*#1471# - show the last call (only on Vodafone),