iphone 4s problem

[davidzl1]

hi, i have a iphone 4s running 6.1.2 that when im using it loses signal and change to searching and i cant make calls or recieve is there a fix for this??

 

[willerz2]

Which method of upgrading did you use to get to iOS 6.1.2

 

[davidzl1]

it was locked to att and i unlocked the iphone

 

[Thomasjtsi]

it was locked to att and i unlocked the iphone

Jon asked what method you used when updating your iOS.

As well... what method are you using for your unlock?