Ok, so I've had this issue more than once, but MMS had completely stopped working, sending and receiving. The last two times it stopped, I figured it was because I cleared all data for the Samsung messaging app, and the only fix was to reset. And this was after owning the phone for only a few weeks. This time it's been fine for awhile, but suddenly stopped again, and I didn't delete the Samsung messaging app data. Any ideas on this issue so I don't have to reset again, I've done so much since the last time I reset, it would really suck to have to setup everything again.
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