Had this problem for almost two months. Could hear phone ring and use speaker phone , but could only hear music and apps via headphones.
Tried all those cleaning solutions, wanted to downgrade OS.
Then it got fixed and I think it was this, as crazy as it may sound.
I was nervous about having FindiPhone hooked up - my wife left hers in a restaurant and it was not hooked-up. So I checked my "Find iPhone" set up, paged the iPhone via "Find iPhone"- and ..... sound came out of the f*#$&ing speaker!
It's now all fixed - sound works in the speaker for all apps.
This is the only thing I can think of that I did that was different from all the other recurring loading, connecting etc. operations. Would love to hear if this works for others.
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Thank you for all your help! I am going to try everything mentioned