I have a HTC one x att and I understand that straighttalk has byod program. I was told I can bring my one x to st. My friend gave me it she has services with att and now has her sim card in her new att phone. I'm going to get the st att sim card. My questions are will 3g work and will data work without problems? Will 4g lte or hspa+ work? Will I be able to roam? Any input? Please and thank you. I currently have HTC evo v virgin mobile.