Do All GMRS Radios Use The Same Channels? Are All GMRS Radios Compatible And Talk To Each other?

In this video I dispel some of the mis-information I have seen in the online world about GMRS radios. Specifically, do all GMRS radio manufacturers use the same channels and frequencies and can one brand GMRS radio talk with a different brand GMRS radio.
For clarification, and hopefully to prevent a few stupid-comments, I am referring to FCC Part 95e complaint "GMRS" radios (manufactured anywhere) but sold in the United States as a "GMRS radio".
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