Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Apple Release iOS 6.1.1 For iPhone 4s
Multiple people have been in touch in recent days complaining about several bugs regarding cellular performance on iOS 6.1 but today Apple has just released iOS 6.1.1 to iPhone 4s users and they say it should fix all the previously mentioned issues.
You can either update OTA (Over the air) or use the direct download link here
iOS 6.1.1 for all devices was but in beta early last week and added enhancements to Japanese maps.
- iOS 6.1.1.