But it isn't unlimited, you said so yourself.
I use on average, 500mb a month on my unlimited plan that I pay top dollar. And yet we all know people who use 10x that.
No, it is unlimited within the context defined in your contract. You want to define a different context and claim it's not unlimited. That's not how it works - you don't define the terms of the contract. Your home ISP or cable is not truly unlimited, either. For your household it is, but you can't pipe it out legally to your neighbors.
You have unlimited data ON YOUR PHONE. You can ignore that and argue unlimited means unlimited under every scenario imagineable, eventhough you were sold no such thing and even if you believed otherwise it doesn't matter.