Anyway, I actually do NOT want a carrier that advertises unlimited data. It's a crock. Nobody can offer their entire customer base unlimited data at a reasonably fast speed for everybody. Any carrier who advertises unlimited data is absolutely throttling that data. It's better for the carrier to be honest upfront.
I actually have totally fully unlimited data on my AT&T plan. And it's never throttled. But I am the exception. I've had an account with them going back to 1992 through my parents. Long before they were Cingular and long before Lucent. I spun off onto my own plan years ago and managed to keep all the incentives long time customers get. Basically if you're a long time customer with X amount of years and X amount of rollover minutes from back in the day, you can cash all that in. A dirty little secret the guys at the AT&T store don't know about or bother to tell you about. Thankfully I have a friend who works in their main Orlando offices.
I pay 84.94 a month. Unlimited everything. And that's with an iPhone 5 that's pulling 40 megabits a second over the LTE. Only thing they want me to pay extra for is the hot spot option where I can use the phone's connection for my internet connection on my iMac. Which is absurd since...I am already using that data and quite a lot out of it on the phone itself.
Yes, you are an exception. The vast majority of people will get frustrated and waste a lot of their life thinking they can get that.
Also, like I said, throttled data depends on factors I said above. If their networks get congested where you operate, they will have no choice but to set priorities on data. It's just math. They can't have everybody going fast. If push comes to shove, then they must put your "unlimited data" at a lower priority than the folks who are paying for a guaranteed speed. In fact, your priority is already lower. It's just that your network is currently not congested where you are.