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It could be an issue with the Hardware or could be a glitch with the settings. To verify that you'll need to reset the phone to factory settings. If the phone is working normally after reset, you can use it, if not send it for repair.
Your microphone is bad. You would have to work on the microphone. To confirm that, try making your calls using a hands free device. If they hear your properly, then it confirms that the phone microphone is bad. Take the phone to a repairer to get this done. But in the mean time, uyou can make and receive your calls with the hands free device.
But if using the hands free device still poses the same problem, then it is a network problem. You would then have to contact your mobile service operators for further help.
when everyone can hear your voice while you can hear their voice during making a call, it seems the problem is in your microphone, it means you have to oven the phone cover at all, find the microphone that use to located in thr bottom of the motherboard, try to clean the circuit of the microphone, or replace with a new microphone..for a while you can use a headset or nokia earphone that similar with your model.
If you used a same SIM card for those phones, I think its signal problem, when signal is low the connection will be disturbed sometime as no sound or cut suddenly during call conversation. Try to use different SIM card provider, with stronger signal will better, then put in these device. If the problem solved then its operator signal problem. The solution is change the SIM card. But if you have try to change with other SIM card with stronger signal but people still can't hear you, then its microphone problem. You need to repair or replace your phone's microphone.
Microphone is not working. I am a professional in cell phone repairs. This is a commom manufacturing problem with this model. The mic has 5 soldering pads and due to bad soldering during manufacturing process one of the pads is not soldered properly. It needs to be resoldered. it can be done only by a competent technician. It needs very controlled reheating by a small nozzel hot air soldering equipment.
Try resetting your phone, if this does not work then it is probably not an internal problem.
Most often this is from simply debris getting clogged in the microphone... seeing as the microphone is a miniscule hole, a small piece of debris can cause major problems.
To fix this: 1. Find the microphone, (it is the tiny dot next to where you plug in your earphones) 2. Get a needle and poke around in it, tip it upside down, and any lodged debris should fall out. 3. Test it out.
I found a solution but not a final one, during the call turn on the hand's free speaker and the microphone will work fine, you can set the hadsfree speaker to the minimal output so you can use it as the regular ear speaker and the microphone will continue to work well.
Many of the options that you can use during a call are network services. For availability, contact your service provider.
During a call, select Options and from the following options:
Call options are Mute or Unmute, Contacts, Menu, Lock keypad, Record, Voice clarity, Loudspeaker or Handset.
The Volume key is on the side of your phone, <--> up or down during a call.