I wanted to know how to check to balance to the virtual Prepaid Mastercard I received when I switched over to T Mobile

Go to the link they send you to claim your card and it will tell you your balance at the top of the page. This page is where you find out your cards info as well. One thing is I never figured out how to set a pin so I had to run it for things that don't require a pin to use or run as credit.