Pay-by-phone transactions let you charge purchases directly to your mobile...

https://collinsexpertcolumn.novacrestiq.com/posts/why-pay-by-phone-is-popular-in-online-gaming-sessions

Pay-by-phone transactions let you charge purchases directly to your mobile phone. Whether you have a monthly plan or prepaid credit, you can easily pay for apps, games, or digital content without needing a credit card