It sounds like his trouble is with T-Mobile not supporting voicemail forwarding on FlexPlay plans, not anything to do with the Nexus One or even any unlocked phone.<p>It sucks, but T-Mobile not supporting call forwarding on FlexPlay plans isn't exactly a secret, he could have easily found this out before buying the phone (or before contacting support):<p><a href="http://support.t-mobile.com/doc/tm23888.xml" rel="nofollow">http://support.t-mobile.com/doc/tm23888.xml</a>