Weird problem. In normal cellular phonecalls, I cannot hear people, they can hear me though.

In skype phonecalls, sometimes I can hear the other person and they hear me fine. But only sometimes.

A full reflash is not possible as I have a broken USB port, however I have attempted to reset to factory settings using the options in the settings.

SMS / 3g data works perfectly. Ideas?

edit: when making an outgoing phonecall, I can often hear the other person. Incoming phonecalls I have this problem