You can flash any Rom, kernel and modem for metro pcs, that's what I'm on right now. Just look up the flashing guide for metro pcs and set up everything through cdma workshop and the phone settings. Then flash the metro pcs mms fix in Android development for the type of Rom, whether it is aosp or touchwiz based.
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Nexus 5/Cataclysm ROM/Elemental Kernel/
Holo White Accent Theme Zip For Cataclysm http://forum.xda-developers.com/show...postcount=5021