The new Samsung Galaxy S4 wasn't included because the survey was completed just prior to its launch by the major U.S. carriers in April.
The rankings of the other five smartphones in the study are: Motorola Droid Razr Maxx HD, 80; Samsung Galaxy S II, 78; Motorola Droid Razr, 77; BlackBerry Curve, 67; and BlackBerry Bold, 64.
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