The 200 MB is no strings attached, but the cheaper rates mentioned in the press release do have strings attached. I'm referring in particular to:
> For T-Mobile voice customers, 'always-on' iPad plans start at just $10 a month for unlimited data including 500 MB of 4G LTE data each month. Customers can add even more 4G LTE data in 2 GB increments for just $10 more per month. For customers who would rather have the flexibility of on-demand data, T-Mobile offers daily and weekly passes. Daily passes include unlimited data with 500 MB of 4G LTE data starting at just $5. The weekly passes include unlimited data with 1 GB of 4G LTE data for $10.
Voice customers get $10 off both recurring plans and daily/weekly plans.
> For T-Mobile voice customers, 'always-on' iPad plans start at just $10 a month for unlimited data including 500 MB of 4G LTE data each month. Customers can add even more 4G LTE data in 2 GB increments for just $10 more per month. For customers who would rather have the flexibility of on-demand data, T-Mobile offers daily and weekly passes. Daily passes include unlimited data with 500 MB of 4G LTE data starting at just $5. The weekly passes include unlimited data with 1 GB of 4G LTE data for $10.
Voice customers get $10 off both recurring plans and daily/weekly plans.