IPhone 4 audio unavailable when calling/answering phone calls.

When I place a call, or receive a call, I am unable to hear anything on the other end, and the other user can't hear me.
If they call and leave me a message, I can listen to that just fine. All other audio works - apps, music, voicemail, etc. I can even Facetime chat without problems, it's just my phone call that drops out.
I've tried the headphone trick, as well as compressed air, restarted, left off for long period of time, removed/reinserted SIM card. None of it seems to help. Any thoughts?

Hi Friend,
Try to use the volume buttons to adjust it. Go to Settings>>Sounds, and check if Adjust Volume with buttons is turned on.
Check in Settings>>General>>Restrictions if there is a restriction for volume turned on. If yes, turn it off and set the volume limit as higher as possible.
The speaker is easy to break if wet, even wet for a little. My girlfriend's iPhone speaker broke with some drops of a drink.
Anyway, check if Restrictions is turned on, rebbot your idevice, be sure you have selected a pernonalized sound (ringtone) that works (change to a standard ringtone), check if "Do Not Disturb" is turned off.
Go to Settings >> Sounds and turn Adjust with Buttons on. In Message sound, be sure you set a standard Apple ringtone. Tap it again to listen the ringtone ringing. If not ring, well, your speaker probably has a problem.
Hope it helps

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