Call TMO and inquire about the COVID plan:
"We are always looking at ways to make things easier for our customers during these uncertain time and we appreciate you checking on this offer to ensure you are fully setup for success with how this discount works. We are offering customers 50% off their services for 3 months but this would require you to have your data plan switched to the 3GB capped option for the discount to apply. This won't impact your rate plan itself or any promotions, it's just in order to get the 50% off the services it would require us to move every line to a capped 3GB data plan. You can revert back to the unlimited at anytime but we wanted to be fully transparent with this offer so you can make the decision that works best for you and your family."
T-Mobile.Store Locator [t-mobile.com]