Wireless News: Microsoft Enters Next-Gen Mobile Arena "The Thera (Greek for "opening" or "gateway") is about the size of a 3x5 file card and weighs about seven ounces. It enables wireless phone calls, messaging, and Internet and e-mail access. With mobile data transmission speeds of 40 kbps (kilobits per second) to 60 kbps, the device also offers multimedia and text data services, Microsoft said."