Xperia Z3 :: Can't Connect To Internet Or Mms

I had my phone on wifi and then I turned wifi off and suddenly my internet and mms stopped working. I have simple mobile and I called them up and changed the APN settings 6 times and it never worked. I tried downloading the settings and when I click on simple mobile it says cannot download. But when I click on t-mobile it says successfully installed but I still dont have it. Nothing works and I am desperate here. It just stopped working out of the blue. I was on the phone with 4 different represtatives that had no clue how to fix it. I did update the phone to the new 5.0.2 and it still doesnt work and it didnt work before that either.