07-20-2012 07:12:39 AM
Samsung Galaxy S II (GT-I9100) and the Galaxy Note (GT-N7000) both work well on AT&T.
Another option is the Galaxy Nexus - this is available for $350 from Google's Play Store, and will work on both AT&T AND T-Mobile, giving you plenty of options.
My personal recommendation, if you have not already purchased or own one of the devices you mentioned, would be the Galaxy Nexus.
07-20-2012 07:18:51 AM
Thanks for the fast reply ,
We own the SII and it unlock that why I asked about it
and I do mean for that one - http://www.gsmarena.com/samsung_i9100_galaxy_s_ii-
Since we don't have plan at AT&T what is the best one and what you recommend
08-11-2012 05:51:54 AM
Also, check out and download xda, they are the best when it comes to troubleshooting and help with Android mobiles.