My iphone 3 when I make a call I can hear them but?

They can't hear me… I've rung o2 and they said do a soft reboot ( press power on switch and the big button on the front) together. I did, still the same… Or go to itune and update… I've not done this yet… Any other ideas first before I login to iTunes and try to update thanks

Added (1). She also said goto youtube and look how to do it with tech guru but I couldn't find it.

It sounds like your mic has just packed in.
If its a 3GS they are pretty old now. Time for an upgrade my friend.

Your microphone has stopped working. You'd need to get the phone repaired or better you can go for a new phone.
You may think about trying out a new Operating System (Windows / Android) this time.

I would suggest with the age of the phone that it is a hardware problem rather then a software one and if you want to continue to use the phone you may have to take it for a repair i'm afraid.

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