I logged in to my Paypal account tonight and noticed an advertisement for Bitrefill and that's the first I had heard of them. Coincidentally, not ten minutes later, my wife told me she had forgotten to buy a top-up voucher for her mobile while she was out and she had gotten the 90% data usage notification today. So I figured I would try out Bitrefill. It was easy and fast. I selected her carrier, the top up amount and typed in her phone number. Then I was given a bitcoin address (text and QR code) to which I should send the payment within a certain amount of time (I think it was 15 minutes). I cut and pasted the address into my wallet and sent the funds. Almost immediately, Bitrefill.com sent a PIN to her phone number; even before the bitcoin transaction was confirmed on the blockchain. We logged into her mobile account, entered the PIN and the funds appeared. Great experience. I almost can't wait to do it again