So I flashed rom after rom, but the data connection wouldn't work. This is how I fixed it for anyone else who might be having problems flashing other roms on metropcs. Press home button. Apps,settings, more.., mobile networks, and or access point name. Here you will make a new apn. Use server fast.metropcs.com instead of the default T-Mobile ones. Just that easy. Enjoy and if this helps please leave a thanks I just got 4.4 Kitkat on my metropcs s4 and love it.