Legacy BBOS devices still require a BIS data plan from the carrier. BB10 devices do not use BIS. On some carriers, there are reports that having BIS in place for a BB10 account causes no issues. On other carriers, there are reports that having BIS in place for BB10 causes the BB10 device to not function for data services at all. It varies. But, BB10 devices definitely do not use BIS data plans.
Occam's Razor nearly always applies when troubleshooting technology issues!
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