Because Google only provides updates for certain builds (jakju), other builds (jakjuxw for example) needs to be tested by carriers in other countries (or some s

Because Google only provides updates for certain builds (jakju), other builds (jakjuxw for example) needs to be tested by carriers in other countries (or some such) and the last stamp of approval comes from Samsung IIRC. If you flash the phone with factory build jakju you get updates from google when they're released otherwise there is 1-1.5 months wait for updates