iPhone sounds muffled to people I talk to

I Have the same issue with my iphone 5s iOS 8.2

the mic works great in viber calls or in voice memo but in regural calls i have the exact problem, my friend on the other side can't hear me as says speak louder,

I want know what is the problem, I tried noise cancelation off and nothing happens

shame on u apple,I spend my money on this and i cant use it,

is it hatdware or software, why does it happens in regural calls only,

mine is doing it too brand new phone 2 friends said exact same thing this is clearly a huge error with this phone and mine is DEF def def going straight back to the store today !! I am furious about it

Did anyone get a fix to this yet? Just had my wife's iPhone 5s replaced and due to cracked screen and this one has the microphone problem. That is, people have a hard time hearing her. Sounds muffled.

I think from additional experience, the iPhone 5 is terrible as a phone. My iPhone 4 was much better, never a voice quality issue.

Cheers I will give it a go. Here's hoping a fix may be done soon or am I just merely wishful thinking

I am being told by callers my voice sounds muffled on the iPhone 6 plus. My callers sound muffled too! Any way to fix this?

I agree

mines also doing it Taking it back to store today as its brand new I am not paying that money for a product thats muffled to my friends its outrageous

That worked!

I turned noise cancellation off with no difference.

Then during a call I intermittently put my finger over the microphone on the back and it corresponded to my voice getting clear-muffled-clear etc.

Deciding what to do from here.

Brilliant thread. I'm new to iPhone and have only owned an iPhone 7plus for 1 month and people have constantly complained about my voice sounding muffled in calls. Been to the Genius bar and they tested the phone, it all tested ok. Tried making some calls and same issue everyone complained. Removed my leather style folio case and problem resolved! So it does seem as though the issue was that I was folding back the folio case front cover and it was affecting the noise cancelling mic. Now calls clear as a bell. Ding ding new case required...thanks

Apparently Apple assumes everyone will hold their iPhone on the lower portion of the phone, thumb on one side, three fingers on the other side, and the index finger resting high on the middle back of the phone or draped around the side. To find out what I was possibly doing differently that might be causing my 'muffled voice' problem I googled images of people talking on an iPhone.

Here's what I learned that I do differently .. I've been holding my iPhone on its upper portion with my index finger draped over the top and thumb and middle finger draped around the sides. It appears, holding the phone this way I've been providing a voice channel to the noise cancellation microphone, thus causing the muffled voice effect.

Rather than try to change the way I hold my phone I've done as others have suggested by going to Settings > General > Accessibility > Hearing devices, and then turning on Hearing Aid Mode (turns off the noise cancellation microphone and increases volume of the speaker when I choose to use the speaker - at least that's my experience).

Thanks someone for identifying the rear mic for me. My Caseology cover has a hole for the mic, but then I noticed, intending to keep my phone pristine, I'd left the plastic peel -off stuff attached to the phone, and it was covering the mic, so I've trimmed it.

I am using an iPhone 6s, so it's not just the 5.

My mother can now hear me!

Amused when I signed in to write this that the 2 stage identification process all came through on one device. Rather negates the security intention, I thought.

Have the same issue. Got it just after 10.3 update

Same problem. Finger over small mic opening on the back (to screen out background noise) works great. Small thing to do in exchange for clarity. At least the phone doesnt melt or explode!

I have a 6s