Cannot Send/Receive MMS Msg's

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Ever since ICS update on my stock note i cannot send any mms messages, any clues?

Everything has worked until now today i just cant send anything, before it worked.

I'm on Bell network.

I know I can't send an MMS if I'm on WiFi for some reason. But as soon as I turn it off it will send.

I tried that as well but it doesn't work, i've also restarted the device few times and no luck, its really weird because it worked fine before and now all of a sudden wont send