HT3893 how to fix no service iphone 3gs

please any one can help with the no service problem

i updated iphone 3gs from 4.1 to 5.1.1 and em facing the same issue with my 3gs.. what i noticed is if 3g is activated on your sim then single network bar signal is displaying and you can use your phone.(for calls and msgs)
go to settings ,network and turn on only 3g its actually helped me. but i am able to use only airtel carrier service.
one more thing if i am at home only 1 signal bar is displaying and if em out 2,3 bars is been displayed.
*NOTE you have to turn on only 3g from network and 3g should be activated on your no.
my iphone is factory unlocked and still am facing such issue:-/ 

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