sony xperia mini ST15i not get 2G network works only on 3G network area after update to 4.0.4 ICS. plzzz Help

[raj mohite]

My sony xperia mini ST15i not get 2G network works only on 3G network area after update to 4.0.4 ICS. plzzz Help... i upgrade my phone to ICS 4.0.4 but after update it works at ony 3G networks that means only wcdma gsm mode or 2G network not showing network shows emergency calls only. after that i down grade my OS to 2.3.4 genger bread but same problem shows...plz help me to slove this.....

 

[g-unit1111]

Contact your provider, we cannot help with account specific information here.