Ok metro flashed 3vo owners. There is now a flashable .zip mms fix for the evo 3d. THIS IS NOT MY WORK!!
*** BE SURE TO THANK OAKIEVILLE over at XDA he is the one that made them.
NOTE: You already need to have talk and text through metro pcs and your esn added into thier system. There is alot of guides here on how to fully flash you phones. But I have done this on 2 4gs and now my 3d. You are going to have a very hard time getting your esn added if you do the programming yourself..
Save yourself the hassle and have them metroflash/houdini then program the rest yourself. JMO
You will need to be rooted with s-off to flash these scripts. For Info to root go to http://androidforums.com/evo-3d-all-things-root/389767-htc-evo-3d-rooting-essentials-official-thread.html
For the SCRIPTS go [GUIDE]3vo metropcs mms fix - xda-developers
IF you want help getting 3g speeds go to this MetroPCS EVO-ALL INFO HERE+[ROM] Metrogenmod 7.1 - Android Forums
here on AF Mikekelso set up a good guide for writing the proper prls to get 3g if your in a 3g coverage area. This thread is for the EVO 4g. The data settings are the same for the 3vo DO NOT TRY TO FLASH ANY OF THE ROMS/SCRIPTS from there.
You can also go to the MetroPcs Prl webstie created by JD2589 over at XDA
Again Give thanks to everyone involved in getting 3g and mms going for both the evo 4g and 3d
Oakieville for his 3vo mms zip for the 3vo, jd and mikekelso for thier guides to 3g settings. Bloodykiller for his web scripts, metro ready roms and data provisioning guides for the 4g (data guides (ONLY) will work for 3vo too).
Be sure to read. And read again. All of the guides. Then enjoy!!!