I only have the 200MB free a month and the 5GB for $10. I am sending a screenshot of my data plan. The only thing I can think of is mine says "capped" which I don't know what that means. But after I use my 200MB of data it only gives me 1 GB of data from my 5GB plan.
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I just went to settings and cellular. The plan was right there when I chose to look at T mobile's plans.
You have to have an Apple SIM as well - it's not available through a T-Mob SIM.