I remember hearing something about a bitcoin credit card. Like, one that you pay for everything with fiat on credit, and then you pay off your bill in bitcoin. So you never have to hold fiat if you don't want to.
What's the best/most reliable credit card that does this?
I'd say either Wirex or Xapo.
Maybe Coinsbank, but I have never used them myself so I can't really comment on their quality of their product or anything like that. I've only touched Xapo which has worked for me every time if you are willing to provide some ID, and Wirex is one of the oldest anonymous CC providers around, you don't even need to submit your ID.
They were called e-coin before they rebranded.
If you want to pay your bills, look onto localbitcoins. In my country there are always offers to pay your bills for bitcoin on there, and for a pretty good price as well.
Dude, I think you're confusing debit and credit cards.