Why is my iPhone 4S no longer able to get a 3G signal?

[iMore Question]

ive updated to iphone 5c i can get 3g signal and i also could get 3g signal on me iphone4s but now ive handed me iphone4s to my partner and now it shows he cant get 3g signal???

 

[Bigeric23]

Maybe this is something to look at:

https://discussions.apple.com/thread/3470007?start=105