I am wondering if the non-carrier branded version of the S4 will support AT&T LTE bands? I believe AT&T uses 4 & 17. 700mhz and 1700/2100mhz for LTE. If we pre-ordered the S4 from, lets say Negri Electronics, would it be FULLY compatible with AT&T's HSPA+ and LTE networks? I know with the S3, (GT-i9300) it only supported AT&T HSPA+. Users were forced to buy the bogged down version with the Qualcomm chip to get LTE. Hopefully that isn't the case this year. I'd like to own a NON-BRANDED phone.