Here you will find many hidden tricks which you can perform on your phones to get more from your phones..

T10
*#06# for checking the IMEI (International Mobile Equipment Identity)
>*<<*<* for checking the firmware revision information (software release)
>*<<*<*>> n-row text strings. if pressing yes you can check the phones text programming in currently selected language.
Shortcut for Last Dialed call menu
If you for some reason don't want to enter the 'Last Dialed calls menu' by using the 'YES' key you can use the following key stroke instead: First '0' then '#'.
Access menu without Sim card
To access to the menu in your phone without having a card inside do the following: type **04*0000*0000*0000# When display say "Wrong Pin" press NO and you have access to the all menus: Info, Access, Settings, Calculator, Clock, Keylock On?, Mail, Phone book. NOTE if you try this on your phone may stop at Keylock On? menu and youŽll have to take your battery out to turn the phone on again. And this will not care about Phone lock!
A way to (un)lock your cell phone on to the network(subset):
1. Press <**<
2. Then on the display appear and give you two choices: Lock to Network ? and Lock to Network subset? (Use arrow keys to select)
3. Enter the NCK number (code is provided by the SP)
4. You have 5 attemps to do this
5. Then your cell phone will work 'only' with the network
Warning: The Service Provider (SP) Lock menu is used to lock the cell phone to the SP's SIM card. Once the cell phone is locked to a specific operator, if one inserts a SIM card from a different operator the phone will refuse to accept it! The cell phone will however accept another SIM card from the same operator. To activate/deactivate this lock one needs a special secret code that is not available to the end user. Your phone can be locked to a service provider FOREVER by doing this! If an invalid code is entered all five times, the menu will exit and be deactivated! Any further attempt to activate the NCK/NSCK lock Menu will result in the response "Not allowed"! However the NCK/NSCK lock can be recover through a direct clearing in the EEPROM.
Message Report
When you writing a message, place at the start of it the code *0# and continue with your message. It's job is like nokias report. It gives you information about the sended message.
T18
*#06# for checking the IMEI (International Mobile Equipment Identity) Information you get from the IMEI:
XXXXXX XX XXXXXX X
TAC FAC SNR SP

TAC = Type approval code
FAC = Final assembly code
SNR = Serial number
SP = Spare
To access SIM-Locking menu of your phone, press: < * [CLR] <
Be carefull or you may lock your phone.
Message Report
When you writing a message, place at the start of it the code *0# and continue with your message. It's job is like nokias report. It gives you information about the sended message.
T28
*#06# for checking the IMEI (International Mobile Equipment Identity)
>*<<*<* for checking the firmware revision information (software release)
>*<<*<*> 1-row text strings. if pressing yes you can check the phones text programming in currently selected language.
>*<<*<*>> n-row text strings. if pressing yes you can check the phones text programming in currently selected language.
The Service Provider (SP) Lock
The Service Provider (SP) Lock menu is used to lock the cell phone to the SP's SIM card. Once the cell phone is locked to a specific operator, if one inserts a SIM card from a different operator the phone will refuse to accept it! The cell phone will however accept another SIM card from the same operator.
To activate/deactivate this lock one needs a special secret code that is not available to the end user.
Here is how to activate the menu:
<**< Lock to Network? if pressing yes you have 5 attempts to enter NCK.
<**<< Lock to Network subset? if pressing yes you have 5 attempts to enter NSCK.
Warning: Your phone can be locked to a service provider FOREVER by doing this! If an invalid code is entered all five times, the menu will exit and be deactivated! Any further attempt to activate the NCK/NSCK lock Menu will result in the response "Not allowed"! However the NCK/NSCK lock can be recover through a direct clearing in the EEPROM.
Shortcut for Last Dialed call menu
If you for some reason don't want to enter the 'Last Dialed calls menu' by using the 'YES' key you can use the following key stroke instead: First '0' then '#'.
Message Report
When you are writing a message, place at the start of it the code *0# and continue with your message. It's job is like nokias report. It gives you information about the sended message.
388
*#06# for checking the IMEI (International Mobile Equipment Identity)
*#0000# to reset the phones menu-language to English.
>*<<*<* for checking the firmware revision information (software release)
>*<<*<*> 1-row text strings. if pressing yes you can check the phones text programming in currently selected language. (298 entries)
>*<<*<*>> n-row text strings. if pressing yes you can check the phones text programming in currently selected language. (160 entries?)
The Service Provider (SP) Lock menu is used to lock the cell phone to the SP's SIM card. Once the cell phone is locked to a specific operator, if one inserts a SIM card from a different operator the phone will refuse to accept it! The cell phone will however accept another SIM card from the same operator.
To activate/deactivate this lock one needs a special secret code that is not available to the end user. (not even to you... or is it ? in case please let me know!)
<**< Lock to Network? if pressing yes you have 5 attempts to enter NCK.
<**<< Lock to Network subset? if pressing yes you have 5 attempts to enter NSCK.
Warning: Your phone can be locked to a service provider FOREVER by doing this! If an invalid code is entered all five times, the menu will exit and be deactivated! Any further attempt to activate the NCK/NSCK lock Menu will result in the response "Not allowed"! However the NCK/NSCK lock can be recover through a direct clearing in the EEPROM.
Shortcut for Last Dialed call menu...
If you for some reason don't want to enter the 'Last Dialed calls menu' by using the 'YES' key you can use the following key stroke instead: First '0' then '#'.
Access menu without Sim card ...
To access to the menu in your phone without having a card inside do the following: type **04*0000*0000*0000# When display say "Wrong Pin" press NO and you have access to the all menus: Info, Access, Settings, Calculator, Clock, Keylock On?, Mail, Phone book. NOTE if you try this on the GH688 your phone may stop at Keylock On? menu and youŽll have to take your battery out to turn the phone on again.
GA628
*#06# for checking the IMEI (International Mobile Equipment Identity)
*#0000# to reset the phones menu-language to English.
*#103# then YES Time and date will be shown.
>*<<*<* for checking the firmware revision information (software release)
>*<<*<*> 1-row text strings. if pressing yes you can check the phones text programming in currently selected language. (298 entries)
>*<<*<*>> n-row text strings. if pressing yes you can check the phones text programming in currently selected language. (160 entries?)
The Service Provider (SP) Lock
The Service Provider (SP) Lock menu is used to lock the cell phone to the SP's SIM card. Once the cell phone is locked to a specific operator, if one inserts a SIM card from a different operator the phone will refuse to accept it! The cell phone will however accept another SIM card from the same operator.