t-mobile. i just looked at my plan......all unlimited.
but your missing the point. There is no unlimited data available to him except from sprint. They are the only carrier that has it.
Verizon- grandfathered in all unlimited people, with 4GB phones, your unlimited, with 3GB, you are throttle on your data if you in top 5% of data usage and/or in very congested area. However, if you leave the congested area, you will be un throttled.
AT&T-Throttle on usage for entire remainder of month after 3GB with 3GB phone and 5GB with 4GB phones. Over those limits, oi are not charged extra, but you will be effectively be put at the bottom of the queue and will only receive the data if its available.
T-Mobile-Same as AT&T, only it's 2GB if on the Plus program and 5g on the premium program.
As I said, sprints the ONLY carrier which you can get an unlimited data plan for your phone, smart phone only.