Apple iPhone 4S iOS 5

Apple iPhone 4S

There's no incoming call alert - Apple iPhone 4S iOS 5

We have found 2 possible solutions to your problem.
Before you start this troubleshooting guide you need to check one important thing:

Can you receive voice calls?
Yes No

Why do we ask this question?

If you can't receive voice calls you need to solve this problem first. Solving this problem will most likely also solve your problem with no incoming call alert.