Good evening, How long have you had your device? Has this been a problem since you had it, or did it just start?
Couple of quick troubleshooting things
Have you powered it off and restarted it since it began happening - powering it off - not just putting it to sleep
lets start with that
Push the power button and hold it
until it says power off
you powered it off?
Does it fail relatively consistently, in other words could you make a test call and see if it has resolved itself, or is it just hit and miss?
Is there someone you can call to see if it is still an issue?
It sounds like you have a bad microphone. Do you have a voice recording application on your phone that you can see if you can record something?
There would be an application called Voice Memo
(shoudl be default on yoru phone)
blue icon, with a white microphone on it.
is this an iphone 4 or iphone 4s?
Do you have SIRI
Siri is the differencee between a 4 and a 4s (its a voice assistance applicaiton)
do you have a bluetooth headset
Can you check your app store to see if you can find a free Voice Memo application
we jsut need something other than the telephone to test the microphone
did you find a voice memo application
OK, so now use that application to record just a small sentence
just something you can record and play back to see if the
microphone is functional.
Who is your carrier?
If the microphone is good, and the callers can't hear you, I would venture to guess that that is some problem with the phone and its interaction with your carrier. At this point, the only option you have is to take the phone to your carrier and see if they can fix it.
Unfortunately, if they can't it might be in your best interest to purchase a new phone
I am sure this is not welcome news, but please remember to rate me based on the quality of my information, not your frustration with your device or Telstra