If you’re currently paying with a Credit Card/PayPal:

Contact Sprint and sign up for the Sprint Unlimited Plus plan. Once you have signed up, go to my.tidal.com and cancel your current subscription. Go to your TIDAL app and log out, you will then be prompted to accept via the Sprint Unlimited Plus.

If you cancel your subscription and do not log out you will remain on your current TIDAL subscription until the pay period is over and then you will be prompted to accept via the Sprint Unlimited Plus.

If you’re currently paying with Apple Pay:

Cancel your subscription though your Subscriptions in the App Store Apple iTunes Cancellation & In-App Purchases Contact Sprint Customer Service - Sprint Customer Service

If you are currently paying via your Sprint account for TIDAL: