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

The number 1-800-439-9568 worked for me to check the balance. Sort of convoluted that I had to find out about that here in this chat and that this wasn't provided when I got the virtual card. Almost like T-mobile is trying to make this process of getting money back harder than it needs to be.

You should be able to check it by going to my prepaid service through Mastercard.

any other suggestions? 

I finally got onto the North Lane site and it works

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.

I tried that Northlane number and spoke with someone only to find out I have a negative balance on this debit card which I didn't think was possible. They are now asking I send a check to them for the negative amount. Sounds really odd. I would have thought that Amazon would have just denied that amount of the purchase.

How long did it actually take for y'all to get cards? It has been about a month for me and so far nothing. 

Thanks, I have called once already. I will try again. It really shouldn't take this long. 

The 800 number did not work for me but texting Bal to 7283 did!  ¡Gracias!

FFS this virtual card stuff SUCKS.  I dont have my card number to even use it and trying to get it SUCKS!!!!  Long story short once you get it write it down and DONT lose it.  I cant even log in on the North Lane site to access it either.