Q: After the upgrade iPhone 6 to iOS 8.3 appeared wheezing during a call.

Hello AlexVrh,

I apologize, I'm a bit unclear on the exact nature of the issue you are describing. If you are saying that you are having call audio issues after updating your iPhone to iOS 8.3, you may find the troubleshooting steps outlined in the following article helpful:

If you can't hear a person on a call or voicemail or if the sound quality is poor on iPhone - Apple Support

Sincerely,

- Brenden