said by cypherstream:
They so conveniently spell out "minutes". What about data usage when you pay for a data plan?
On a 4G phone, if the 4G is down, can you still make a call?
I think the data usage portion is covered under the last paragraph he quoted, "... and you lose Service in your Coverage area ..."
As for phone calls, the call still completes over 3G or 1xRTT, so even if 3G goes down in addition to 4G, you can still complete a call.
As a matter of fact, I had 4G a few minutes ago while walking my dog, placed a call, and when I hung up noticed I had lost both 4G and 3G again, yet didn't notice a single hiccup on the call itself.