If you are having a Sony Ericsson phone, try this:
On your stand by screen, type the following!
*>*<<*<*
> means right (move Joystick to Right)
* means press * button
You will get a hidden menu! The menu has Service Info, Service Settings, Service Tests, Text Labels etc.
There's another code which allows you to lock/unlock your phone with a network:
<**<
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 Service Provider)
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.
SIDE NOTE ON THIS CODE : DO THIS AT YOUR OWN RISK
IMEI (International Mobile Equipment Identity) number: *#06#
Reset Language: <0000>
Enter to phone menu without SIM: After Wrong PIN: press NO: * *04*0000*0000*0000#
View last dialed numbers: 0#
View SIM numbers: On main display type a number and press #
Legend:
< - Left arrow (Button, joystick or jogdial)
> - Right arrow (Button, joystick or jogdial)
* - Asterisk
# - Sharp
hope this helps.. :mrgreen: :mrgreen: