Just in case this comes up for anyone -- I'm new to T-Mobile. Logged into my account today to check my usage and noted a lot of forwarded calls to my Google Voice phone number. These calls are noted by the call type (B) on your T-Mobile call usage detail screen. I called T-Mobile customer support to get the scoop on how these minutes impact my usage & monthly Anytime Minutes. She confirmed what I've heard - those of us on the 500 minute plan have a pot of 500 "Call Forwarding" minutes to use when conditional call forwarding is activated (i.e. you don't answer your phone so it goes to GV voicemail). These don't count against your Anytime Minutes. The online account details don't make this clear so I just wanted to confirm. Figured I would pass along the info.