Traveling to Canada or Mexico as a T-Mobile customer previously meant having unrestricted access to your high-speed 4G LTE data, just like you would at home. This move isn't surprising when you consider T-Mobile is pushing unlimited plans more aggressively than it was in 2015.
The reason for this downgrade in data availability, according to Engadget, is that T-Mobile needs to pay heavy roaming costs in these countries.
According to T-Mobile less than one percent use more than 5 GB of data on their trips overseas. Still, it appears T-Mobile has some issues to work out, this time around being trouble with how much data its customers are using when roaming overseas.
T-Mobile is going to limit LTE data further, and starting next month customers with T-Mobile ONE and ONE Plus plans only get 5 GB of guaranteed LTE data in Mexico and Canada. It's just LTE in Canada and Mexico that's capped. The company is trying to "prevent usage beyond the intent of the product" with the new 4G LTE limit. However, this is a monthly fee, better than Verizon's plan that offers $10 per day. "After 5GB of high-speed data is used in Mexico and Canada (or your high-speed data allotment is reached, whichever comes first), customers will stay connected with unlimited data at Simple Global speeds (up to 128kbps for most plans or 256kbps with T-Mobile ONE Plus)". While 5GB is a healthy amount for a short trip, it's still going to change your behavior - you may end up using hotel WiFi when you can instead of relying exclusively on cellular data. It was also a good option if you lived in Mexico or Canada and wanted to avoid your local carriers.
T-Mobile subscribers got some fantastic news earlier this week.
The company went on to say that "less than 1 percent of people with this benefit travel to Mexico and Canada use over 5GB a month". It's not unlimited LTE but it appears subscribers have been consuming large amounts.