what program you using to send mms? arcsoft? I just got mine fixed and it was a pain in my balls. one thing to look for is your mms server settings. on mine it's in menu, pix options, servers. but I've also seen where you had to change it in the registry. for sprint the server is
http://mms.sprintpcs.com/servlets/mms ...and use sprint rather than the internet to connect. tore may vary but that's where I'd start looking.