On my 600, When i wanted to put someone on speaker phone I remember I used to press spacebar.

Or when someone was calling I pressed backspace to send it to vmail,

or when i wanted to hang up on someone i pressed backspace too.

or when a ringtone would ring (either for sms or phonecall) I could press a side button and it would silence.

Cant seem to find this on the 650 any one else have any ideas on how to activate this or what software adds this functionality?