Bitrefill 

You can top up your phone and buy many different gift cards for exemple (steam, ebay, Spotify, Netflix, nike, ovs, samsung, etc.) 

Accepted payment cryptocurrency (Bitcoin, Litecoin, Dash, Dogecoin, Ethereum, etc) 

There is no need to create an account to buy at Bitrefill, although you always have the opportunity and, in addition, it allows you to maintain a balance with the platform that you can use to purchase any of the offered products or services without paying blockchain commission transactions and without waiting for confirmation payment.

They also got referral program:

After a referral purchases  100$ products from Bitrefill, you will receive  10$ in BTC, automatically credited to your account on the platform.

Usually if you have some questions the support service will respond within a few hours, but it is always useful to wait at least 24 hours.

I tested that service works perfectly. When you send cryptocurrency send it from your personal wallet to not cause delay of delivery. If you will send from exchange you will have to contact their support to process your payment manually. 

More information you can get on:

Website: https://www.bitrefill.com/

Twitter: https://twitter.com/bitrefill

Telegram:   https://t.me/bitrefill