I have a really annoying but strange issue I cant make phone calls or send and receive text messages but I can browse the internet.
I have a Samsung Galaxy S3 which im sure is sim unlocked 100% sure. It has been working ok up until recently something has changed but Ill be dammed if I know.
I am using 3ITA sim
Im running the stock ROM ..I tried to re-root the phone but this did not work.
I have done a factory reset this has not worked.
If I take the sim out of the S3 and put in into another galaxy s3 it works fine. I can make and receive phone calls.
But soon as I put it back in the S3 it says "Unable to regsiter on network" so it HAS to be the S3 but im sure it is sim unlocked!
I tried similar to this: (But when I got to network lock it says on my S3 (MENU NOT EXIST PRESS BACK KEY Current command is 186) what does this mean???
"Put in a different SIM card to the one you use with your carrier.
Switch the device off and on again with the SIM card in place.
Open your dial pad and then type in *#197328640#.
Go to Main Menu >  UMTS >  Debug Screen >  Phone Control >  Network Lock > Options Perso SHA256 OFF > and wait 30 seconds or so.
Then hit Menus and choose Back. You should now see Network Lock. Then choose  NW Lock NV Data INITIALLIZ."
Please can someone help !!