Hi guys. Just got my new M8 on Friday, and the only problem I seem to be having is when I am using the phone as a phone (no bluetooth, just phone to ear), I can barely hear what the other person is saying. The volume is just way too low. Volume sliders are all set to max, and using the volume up button during the call doesn't help. Call volume is ok over my bluetooth, though I wish it could be a bit louder. Any suggestions?
Thanks!
Like SuperDave said the speaker is positioned and pointed toward the top left of the phone. You may find positioning your ear somewhat above the left corner of the phone will give you the best sound reception while in a call.
Aside from that there are a couple of other things you could try:
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A few people with in call volume problems have mentioned that they had to hold their phones away from them while adjusting in call volume (it didn't change when next to their ears. It may be related to the automatic pickup/answer call feature that occurs if you have it enable to answer a call when you bring it to your ear). After making a call you can try holding it away from you while adjusting.
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The below applies to the m8 Harmon/Kardon edition and was a recommended solution for in-call volume issues for that phone, but may work on your phone too.
Perform a soft reset.
A soft reset restarts your phone and does not erase any of your content or data.
Press and hold the Power key and Volume Up key for 10 seconds.
Your HTC One® M8 Harman/Kardon® edition
restarts.
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You can access a HTC diagonstics menu by typing the following into your phone when at a dialing screen:
*#*#3424#*#*
The first test in the audio test option plays from the in call speaker. If the audio test seems louder than your in-call volume then you can rule out the speaker itself being the issue.
That device has problems then. Time to get it replaced.
I'd ignore Pain's recommendation. In call volume has no relation to mobile data speed. If you try to get a replacement phone you risk getting it replaced with a worse phone. If you're happy with everything else about your phone (aside from this volume issue which is highly unlikely to be a defect) then don't risk it.