Unlimited Mobile Broadband? Without 5GB Limits? Really?

Four or five years ago, Sprint, Verizon, and the other carriers did have Unlimited Mobile Broadband, but that went away several years ago. Now, all the major carriers have a 5GB limit on your monthly 3G usage. But wait! Sprint now has 4G service which is up to 10x faster, plus it is Unlimited! The coverage is limited to certain cities, but you still get 3G service as well when not in a 4G area.