I was having issues with low call volume. I put duct tape over the speaker rubbed it in the best I could. That worked for my. I let my son play with my phone. I believe he clogged my speaker. I should mention I tried the suggested method first. I also washed my speaker with a small brush with no luck.
I thought this was so full BS that it would never work but I tried everything else and nothing worked. I didn't have Blu-Tac but I had some reusable silicone tape and it did the job. Lol before I tried it I would have given it 10% but by golly it worked.
OMG, thank you for the dollar store fix. Couldn't believe it worked so well. Had done all the softwars stuff, even tried vacuming out the earpiece...nothing. Tac...FIXED! the bonus i can stick stuff to the fridge now