Q: When I receive calls on my iPhone 4, I hear dead air but the people on the other end can hear me. When I dial out calls, everything works fine. I've updated everything for my phone as well.

Hey there Iwag24,

It sounds like you are unable to hear the person on the other end of the line from the receiver on your phone. I would use the troubleshooting for that from the following article named:

iPhone: Receiver and call audio quality issues

http://support.apple.com/kb/ts5196

1. Receiver

Follow these steps to resolve the issue:

1. Increase the volume during the call.
2. Make sure nothing is blocking the receiver. If you're using a protective case or display film, remove it and try again.
3. Make sure nothing is plugged into the headphone jack or the dock connector.
4. Check the receiver opening to see if it is clogged with debris. If necessary, clean it with a clean, small, dry, soft-bristled brush.
5. Try another location with better signal. If the audio issue happens only when on a call, it could be due to the location.
6. If the iPhone is paired with a Bluetooth headset or a car kit, try turning off Bluetooth on your device. Learn more about troubleshooting Bluetooth connections.
7. Restart the iPhone.
8. Make sure your device is up to date.
9. If the issue is not resolved, contact Apple Support.

If the issue persits when using speaker phone, use this article instead and start on step 4:

iPhone: Troubleshooting issues making or receiving calls

https://support.apple.com/kb/TS3406

Thank you for using Apple Support Communities.

Cheers,

Sterling