The hearing of person talking is very low on one of the phones

perhaps getting him a hearing aid would be quicker way to fix problem . most phones have limited volume .

the speaker in your mobile which provide hearing voice is disbalance to their orignal place .place it its orignal place or change the speaker. This the only solution.

yo phone mouth piece is not workin so take it to repair or use headsets.

I have the same sort of problem...kinda..lol. My Vtech sorta 'cuts out' when there is noise at my hosue. The person I'm talking to can still hear me but I can't hear them. If my son starts crying or there's any other loudish type noises on my end, it's like the phone is trying to cutout my background noise, but all it's cutting out is the person talking to me. It's not that the noises in my house are loud and I jsut can't hear the person I"m talking to, b/c if i cover the mouth peice then no matter how loud the sound in my house is i can still hear the person i'm talking to but I HAVE to keep the mouth peice covered. It's really annoying!

Hello,

If the person you are talking to can not hear you and you confirm this from different people you to talk and they all said same thing, they cannot hear you, then it means the problem is that the mouth piece of your phone is bad and will need to be replace in other for people to be hearing you when you call or you are been called.

All you need to do is to replace the mouth piece of your phone and you will see that people can hear you.

Take care.

Have you tried raising the call volume level on the phone?
The GMRS-X1 will only amplify a preset ammount, low signal in = Low signal out

This problem I've had myself But it will only solve the problem if your cell uses a sim card. When the sim cards go bad thats whats happens your hear them but they can't hear you or vice-versa.

Take the phone to a mobile reapir center and hvae them replaced teh ear piece and also the speaker.

replaced the speaker in the ear piece this will correct the problem

I had the same problem with that phone... while manipulating the mobile part (cover) you can slightly improve the volume.
Another point to check is the button on the side of the phone which allows to increase or lower the volume: it could happen that you turn the volume low without noticing it...
My solution was to replace the phone.