Sony Ericsson S710a "phone makes clicking sound answering" Questions

...phone to my ear, there is no sound - the person on the other side can also not hear me. I checked volume control, seems fine. Someone suggested the phone speaker might be bust, but why does it still ...

...phone regularly (With the sound coming from the handset, and not the handsfree device). NOW my phone does this all the time, as well as not even allow me to hear my caller, or have them hear me. I ...