The “Enable 3G” switch is no longer present in iPhone 4S. The purpose of disabling the 3G radio is to conserve battery life or forcing the iPhone to connect to EDGE network where 3G signals are weak.
The “Enable 3G” switch still present in iPhone 4 and iPhone 3GS running iOS 5.
UPDATE:
Threads about the missing “Enable 3GS” switch on Apple Support Communities.
- Why I cannot enable 3G on iPhone 4S
- Where is “Enable 3G”?
- How do i turn off just the 3G on iPhone 4S
- can’t turn 3g off on iPhone 4s
- iPhone 4S unable to turn off 3G?!
Please let Apple know that you want this feature back, regardless if it was a bug or design decision.
http://www.apple.com/feedback/iphone.html