Very little of the streaming video you describe is off-net for any of the carriers. They run caching servers within their network at major POPs. The network isn't congested because of said video because it's already downsampled content specifically for mobile streaming.
Video streaming on any of these carrier networks consumed by your phone or tablet is curated for mobile devices and doesn't impact their Internet connectivity at all. Very little of that traffic will ever egress the carrier's network. Ultimately the congestion is all oversubscription of the spectrum allocated to the tower you're connecting to.
Video streaming on any of these carrier networks consumed by your phone or tablet is curated for mobile devices and doesn't impact their Internet connectivity at all. Very little of that traffic will ever egress the carrier's network. Ultimately the congestion is all oversubscription of the spectrum allocated to the tower you're connecting to.