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Unremovable Spyware on Samsung Devices Comes Pre-installed on Galaxy Series Devices
(cybersecuritynews.com)
This is a most excellent place for technology news and articles.
It's not only a carrier issue but it is an issue only with Samsung's bought through carriers. Samsung obviously allows that or subsidizes them somehow. AFAIK with Samsung and carrier branded devices they have their own update schedules as well that is separate than just updates from Samsung.