I am not sure what to think of this but if I was a betting man, I would say that this Samsung phone with FCC ID A3LSGH-I777, is the Galaxy S II, AT&T version, also rumored to be called the Attain. why would I think that? Because AT&T usually tags Samsung phones with the 3 letters “SGH.” If you remember the rumored AT&T SGS2 with the sliding-keyboard had SGH-i927 as its model number. The SGH-I777 is also carrying the 850/1900 MHz GSM and WCDMA bands which means that it will work on AT&T’s 3G/HSPA network.
Apparently there is some runner, who goes under the nickname “emagrad,” who has used the Samsung SGH-I777 to record his or her runs in the state of Massachusetts from July 13 to July 27 of 2011. It clearly states “on my AT&T Samsung-SGH-I777.” Could this be a test unit? Only “emegrad” would know!