I can confirm MMS is working for me. I did an upgrade from 2.2.1 to 3.0b2 last night. The first time I tried I got the red exclamation point. I turned WiFi off and rebooted the phone. I then sent my sister (on T-Mobile) a picture. She sent me a message back saying she received the picture, then she sent me a picture, which I received just fined. So I can send and receive pictures in 3.0b2. Haven't tried to receive video yet.