There doesn't seem to be any rhyme or reason to which carriers release updates for their Android updates first, and once you stray outside of the shallow waters of flagship smartphones, things start to get really inconsistent. For example, AT&T is updating its carrier-specific version of the Samsung Galaxy Tab 4 8.0 to 5.1.1 today, at least according to this support page. But at the same time, Sprint's Galaxy Tab 4 7.0 is only just now getting upgraded from Android 4.4 to 5.0.
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