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Open up the dialer and enter - *#06# to check your IMEI number, if you see "IMEI Null or 000000 ", you need to reconfigure the settings to fix the no signal or not registered on network problem on your Android phone.
In the dialer, type- *#197328640# or *#*#197328640#*#*
You will be prompted into the Command mode, provided On the screen, Select on Common, normally option 6
Now Select (FTM) Option 1. FTM (Field Test Mode) is for debugging and testing, if the option is on, you will have to turn this OFF.
As soon as you turn this off, your NULL or altered IMEI number will be restored
(Important) Without leaving the Command screen, press the Menu key, the button that's found left of the Home button.
Select Key input and enter option 2 which will turn your FTM OFF
Wait for a minute. Remove your battery and SIM card for two minutes, place your battery in your phone back but not the SIM card. Turn on the device then.
When the phone is booted, enter the command mode again dial - *#197328640#
Select the Debug Screen, normally option 1
After that, choice phone control, option eight
Click on nas control, option 3
Afterwards, click "RRC (HSDPA), option 5
To Fix not registered on network or Null IMEI #, click RRC revision, option 2.
Choose the released of your phone, here we will choose option 5 (HSDPA only)
The final step to fix Null IMEI # is to turn off your phone and insert your Sim card or else reboot your phone and then insert the SIM card to dial *#06# to see if the IMEI number is restored.
You have managed to corrupt your EFS folder where your IMEI is stored.
Usual reason is that you have installed a non network firmware on a network locked phone.
Reinstall the network firmware to resolve IMEI NULL issue.
Once the issue is resolved, Get the IMEI number by typing *#06# on your mobile phone and get the IMEI number. Then visit OnlineGSMunlock.Com to get the unlock code for your Samsung Galaxy S2 at affordable cost. with easy unlocking guide. Good luck.
Hi if you want to unlock your Samsung mobile from network lock .Then visit Mobileunlocksolutions.com here they ask you the mobile model ,network name to which your mobile is locked and the IMEI number of your mobile .Then at last they deliver you code to unlock your mobile.
The nokia 3110c restore security code can be sorted by going to:
http://www.lur.nu/nokia_mastercode/security_code.php type in you IMEI Number, to retrieve your IMEI number type *#06# this will generate a master code use this to restore your security code. - thanks Anand -