[EVO 4G Android Development] silenthatred:
Well I finally got this working. A reflash and selective Titanium restore got my PRL and Profile updates working again, but still no MMS. After searching around last night for "generic network failure evo," I started finding a bunch of posts with the same problem relating to APN settings. So I looked at mine, a low and behold, they were blank. So I thought, "fill in the correct settings right?" When I did this, they would seem to take, but what I typed in wasn't being displayed. When I would go back into one of the settings, what I typed before was there, but didn't display when I hit okay. When I went into some of the other menus, the messaging app would eventually force close. So after digging though some posts, I started seeing APN apps that would allow you to change APNs. First, I tried APN Manager. When I opened it, it said I had no active APNs. So I went to display APNs and I had two called Sprint with a gray bar next to them (more on that later) and selected one. It would say they were active, no matter which I picked, but the bar stayed gray, and MMS still didn't work. So next I tried APN Backup and Restore and used that to manual edit the xml file and tried to restore it. MMS didn't work and the APN in APN Manager they were still gray. I finally found APN OnOff, which showed APN as off, despite APN Manager saying "Enabled APN: Sprint." APN OnOff had a setting to "Reset to default" under the "Show APN list." I selected that and it did it's thing. I also selected the option to "Keep MMS enabled." It has a widget that I added to one of my home screens, however, when I tried the on/off toggle, it just kept bringing up the APN list. I had been restarting between changing settings in each of the apps, and got tired of waiting for the phone to reboot, so this time I instead turned on airplane mode for a minute or so. When I turned off airplane mode and press the toggle, it changed to on. In the aforementioned APN Manager, the active APN now showed in green and the inactive one in orange. Some of the MMS messages I had waiting instantly came in, one being a picture of my butt that I sent to my wife that she sent back to me. I had to restart to get the two of the others to download, but after that, they all worked. Success!

So in short, if you are having issues, try opening messaging, then go to menu, settings, MMS, connection settings. If they are blank, try filling in the following:

Name: Sprint

MMSC: http://mms.sprintpcs.com

MMS proxy: Leave it blank

MMS port: Leave it blank

MMS protocol: WAP 2.0

After you do this, the screen should look like this (minus the screenshot successful message of course!):

If that doesn't work, try installing APN OnOff from the market, go to "Show APN list," press menu and select "Reset to default." Select the APN you want, the go back to the main screen and select the option to "Keep MMS enabled." Close the app, turn airplane mode on for about a minute, then turn it off and place a widget for APN OnOff somewhere on your home screen. Toggle the on/off and it should go to on. Restart the phone and MMS should work afterwards. If it works, you should be able to uninstall the app afterwards.

Now as to why this happened, my only guess is that I sometimes used the built in task killer to stop the app Words with Friends. Sometimes I would accidentally double tap and close messaging and/or phone. Closing phone would cause a reset of my mobile and data connections. I'm guessing that had something to do with it by corrupting the settings or something. Hope this helps someone!