Apple iPhone 4 iOS 4

Apple iPhone 4

iOS 4

You can't use tethering - Apple iPhone 4 iOS 4

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

Can you make a voice call?
Yes No

Why do we ask this question?

If you can't make a voice call you need to solve this problem first. Solving this problem will most likely also solve your problem with using tethering.