If you use more than the average data usage (3GB), you may have to reconsider.
Some people stream videos + music all day.
I barely use 1GB a month. Right now I'm sitting at 370MB for the current month. I'd probably go with the 2GB plan to be safe since unused data gets refunded anyway.
So I active my Fi account. then cancel my TMobile service and I'm all set? hmmm. I should probably do that