Hey, I have an unlocked 3GS on TMobile, and I can't seem to send MMS. I've had an unlocked 2G and 3G, and I've been sending MMS on the 3G without any problem. My MMS settings are the same on the 3GS as my 3G, they are: APN wap.voicestream.com MMSC 126.96.36.199/servlets/mms MMS Proxy 188.8.131.52:8080 I can receive pictures just fine, and the SMS app shows the little camera icon to add images to a message. When I send the image, it says "sending" with the progress bar almost full for about two or three minutes, just like on the 3G. It waits about twice as long as it took to send messages on the 3G, and then says Message Send Failure. Initially I suspected that the larger image size was taking longer to send, but I've tried sending them from three or four different towns (including downtown San Francisco) to no avail. Maybe the larger image size is a problem for TMobile? I don't know to what extent the phone compresses the image before sending. Anybody else having trouble with MMS with 3GS on TMobile? I'm hoping it's not a hardware problem.