Snail, what carrier are you on? That's pretty retarded if they have a 5gb plan and an "Unlimited w/5gb cap" plan, and they're both the same price. Who does that? I thought all the carriers (except Sprint) had a 100s of MB plan (for cheaper) and an "unlimited" plan?
edit: Wait, nm, read the topic line.
T-Mobile has an Unlimited plan for $30 (w/5gb cap, and I've gone over 5gb never been throttled) and a 200mb plan for $15/mo. T-Mobile doesn't have a 5gb plan for $30.
Sprint has multi-tiered pricing.
People posting in this thread need wise up though. First, we're not talking about just phones. Even if we were talking about just phones, why on earth would you argue that companies shouldn't provide you with exactly what you pay for?
Frankly, the people disagreeing are just being difficult, or enjoy being obnoxious twists. These companies say we're getting unlimited, and we pay a premium. Which means we better get unlimited.
Comparing unlimited internet to free speech is... well... laughable.
I would be perfectly happy with a totally tiered pricing system describing exactly what the restrictions are. However, when I signed up for my plan, it said unlimited. There were no addendums, no caveats, and no fine print. Of course, they always have the clause about terminating for whatever they feel is necessary, but it doesn't take a lawyer to tell you that you better be getting a refund if their terminating you for using to much on an unlimit plan.
Luckily, I'm not in the position that the OP was. I signed up for unlimited when it actually meant unlimited. Once, when we tried to renew our phones, Sprint tried to change me to a 5GB plan. I had a VERY in depth discussion with their management (having a business class account is nice) regarding what "renewing" a contract means vs. "changing" a contract.
However, after that little fiasco, I certainly understand where the OP is going and agree. You don't pay for 12 gallons of gas and get 10. You don't buy a gallon of milk and only get 1/2. You don't buy 5GB of internet and only get 2, and you don't buy unlimited and get shut off when you use it.
It's pretty simple. There's no argument.