The Samsung Galaxy S II Skyrocket and the new HTC Vivid are AT&T's first 4G LTE smartphones, not to be confused with HSPA+ "4G" devices they've launched in the past. AT&T's 4G LTE just went live back in September and so far they only have 5 markets currently with 4G LTE although 4 more are coming this weekend. We decided to give their relatively small 4G LTE footprint a run for its money and see how she performed. Details and speedtest results are available after the break.