[mikeash]

None of the "unlimited" plans are actually unlimited. They just use soft caps where you're throttled to 2G speeds after you exceed your allotment, rather than charging you overages. Some carriers are starting to do this for all their plans, so "unlimited" is now just becoming a weird and misleading term for one particular data cap. At least on AT&T, the "unlimited" plan isn't even the one with the largest cap, so it's particularly bizarre.

No doubt Comcast's "unlimited" offering will be similar. You may not get charged overages, but good luck watching more than a few movies per month with it.