went through this myself recently. Essentially, the way to make it work is for TMob to add the n9's profile. Or perhaps its possible somehow to impersonate another...but of course there is no user accessible setting for that. bottom line: yelling at TMob is probably the easiest solution. In fact if you do an online search for Tmobile forum, mms blurry there was an open discussion regarding adding support for the N9, among others. Obviously must not be high on their priority list..