I recently login to my.t-mobile.com and check my current internet plan. 
I currently have 2.5GB data for each line on Simple Choice plan.
I click "CHANGE DATA" and select 4GB data. 
I got free upgrade from 2.5GB to 4GB for all the lines with no extra charge. 
I call 611 and the rep confirms that is a promotion from 2.5GB to 4GB of data free of charge until Feb 2019.
https://my.t-mobile.com/plans.html 
YMMV
              
 
                
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https://slickdeals.net/f/9086327-t-mobile-customers-get-1gb-of-extra-data-until-feb-2019-ymmv
https://slickdeals.net/f/9086587-t-mobile-upgrading-10gb-month-customers-to-unlimited-data-through-feb-2019-ymmv
So they will give you unlimited if they cap your speeds to 10mb/s maybe
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Same here but finally I gave up and moved to one as they weren't doing any promotions for SC plan any more.
What do you have right now? 2 or 2.5?
true & I m one of those with 8- 2gb lines...btw what happens after Feb 2019??