Does the T-Mobile G1 support VOIP?
Originally not, and many thought it probably never officially would. From an interview with the CEO of T-Mobile: “When I talked to Cole Brodman, the CTO of T-Mobile, after the event about what would stop something like Skype from designing a program that could run on the phone, negating the need for a massive voice plan, he said he had “worked with Google” to make sure Android couldn’t run VOIP.” http://blog.wired.com/business/2008/09/three-years-and.html .
But more recently Andy Rubin, Google's Vice President of Mobile Platforms made [this blog post](http://googlepublicpolicy.blogspot.com/2009/08/android-and-voip-applications.html) discounting a newspaper's claim that Android does not support VOIP, writing "the first generation of our Android software did not support full-featured VoIP applications due to technology limitations, we have worked through those limitations in subsequent versions of Android, and developers are now able to build and upload VoIP services.". There are currently the following Android applications offering [true] VOIP: SIPDroid, a project which allows SIP VOIP connectivity. [SIPDroid](http://sipdroid.org/)