I can barely hear people speak.

You may have a broken microphone for speaking in to.

Hello,
If callers cant hear you when you speak to them on your phone,it means that your phones mouth piece is bad and you need to replace it and to do that you need to take it to phone repair shop.

You can also try using an external ear piece attached to the phone to make and receive calls before you fix the phone.
I hope this helps you. contact me for more help.

check the mouth piece of the mic

not sure if its the same problem but i had that with a different model and was told when i placed the charger in the phone it moved the mic slightly and thats why it was not working as it should i used my hands free every time i made a call mine was so bad ..it was a manufacture fault so i was lucky and had the phone changed free !!! hope this helps

Try them in intercom mode. If the flaky unit still does not work, the something along the microphone circuitry is likely dead. If its in warranty, get a replacement from the store or manufacturer.

the phone's Microphone or Microphone IC is faulty. replace the Mic its under this place. or even just clean it maybe some dust would defect it.

.please rate this post as good as u can so we can help others.

What type/amke/model of phones?

try with ur handsfree that u got with phone or replce ur mic or clean the hole near ur swich side from where u speak. reply me

Turn up the volume control.  Don't have the manual in front of me but go into phone settings and look for the volume settings( not the ringer).  Check in your manual, you'll find it.