I got my invite today, too. I plan on using mine (probably mostly for voicemail organization/transcription, possibly for VOIP), but I have a question to any existing Google Voice owners that have a Google-assigned number: Google says that I can't switch between a Google-assigned number / my mobile phone number. Does this mean that in order to use any of the features of GV, I have to make people use my Google-assigned number? Or, is there a way for me to have people use my existing mobile and still take advantage of the mobile number-only features? Thanks!