"Would steaming a YouTube video even be possible once the data is used up and it drops to a slower speed? Probably different for each service, depending on your signal strength to begin with?" If you're out of data, then streaming is pretty much a no. When you have data, streaming works no matter what plan you're on. BUT, it is highly dependent on congestion -- this means if a lot of people are using the system in your area, streaming is harder, and sometimes impossible.
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