Everything else seems to. 3G is fine, wifi is fine, definitely getting data. I've already exited and reopened the messages app, restarted the phone, tried it on only 3g, tried it on wifi, tried sending texts (which works), force restarted it (power and home button until apple logo)...nothing seems to work. As far as I can see everything else is fine. The only reason I could think of that this could happen is because its been on airplane mode for the past week, but I really don't think that'd do anything... Any help?