You would call them either mute or dumb (as in "deaf and dumb").
Ethical.
Communications impaired
mute ** Speech impaired.
He doesn't want to talk to you. Find someone else.
Shouting.
kind
Crazy.
answerphone
One name for someone who likes to talk a lot is "chatterbox". An adjective for someone who likes to talk a lot would be "gossipy".
No. Itouch's cannot call, but if you want to contact someone you can use e-mail.
If you talk to them but don't consider them a true friend then they are just an acquaintance.
blind