Looks like Sammy's prepping to bring one of its big Galaxy guns to AT&T's 4G race. The mystery handset, bearing the model number SGH-i727 and FCC ID A3LSGHi727, just popped up on the Commission's databases giving us a glimpse into its guts and bolts. While we can't quite speculate as to the phone's screen size, the filings do show it packing the orange-colored carrier's 850 / 1900 WCDMA and HSPA bands, in addition to its particular brand of 700MHz LTE and (surprise) LTE AWS -- you know, should that T-Mobile acquisition