Well, I finally fixed my problem with not being able to send or receive MMS.
I have a AT&T M8 that recently switched over to T-Mobile. I decided to root, s-off, and changed over the developer edition ROM. I was even able to get OTA update after it was done.
I am ecstatic and exhausted after the process but seeing that I was able to get ride of that annoy AT&T boot up music was all worth it.
Now my follow up question is this. I now have a rooted phone with S-off. Should I worry more about security in the future? I typically only download from the Play store but I believe that there are a lot of junk out there as well. Should I lock my bootloader since I won't be doing anything like this the future?
All feedbacks are appreciated.