World of C E L L U L A R Secrets
   

L e g a l _n o t i c e:
All information and Software found on these pages is to be used for educational purposes only and further more: I take no responsibility for illegal use or damage caused by information or software taken from any of these pages.

Ericsson T28

Secret Codes

*#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.

Software


The phone should display something similar to this:

PRCXC125115          - Cell phone's internalproduct code. 
PRG               	      - Firmware revision - software version (date & time stamp).
990718 1258 

LASTEST  Version is: <990831> 

Version <990718> 

Software update, how?

I have been asked a lot about how to update the software in cellular phones.
The easiest thing to do is to go to the nearest Ericsson
dealer and make him do it for you. Just remember that it is supposed to
be free (a receipt is requiet) so don't let him tell you anything else!

Service Provider 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. (not even to you... or is it ? in case please let me know!)

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.

Tips and Info

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 '#'.