Yea
nope i have it.............. (i hate it)
Voice chat can only be used in online multiplayer matches. You just speak into the microphone to voice chat.
To do voice chat you have to enable video chat. You can also enable a phone call from your chat window. These are your two current options.
Voice chat costs in Gmail your credits. You can add credits worth money to your account. Video chat can be free of cost.
Nope. Only text chat.
No.
Voice chat was added in patch 2.3 with zul'aman.
The best way would be to get a third party voice chat client. The in-game voice chat is horrible quality and people just do no use it. Two of the main ones are Vent and Team Speak.
On Windows. It should come with msn messenger which has voice chat in it (which is not very useful because then the other person needs msn as well)On Mac: It comes with I-Chat which I think has voice chat on it (but again the other person needs I-Chat too)Short of that, use a phone?
Most cell phones do have free chat applications. If you have a smartphone you can download many services. The top chat service for mobile phones are Chat Plus and Text Free.
Voice chat on your computer happens through passing data over your Internet connection, not standard "voice" phone lines.