UK players used to rely on phone bill deposits, typically capped at around £30...

https://wiki-velo.win/index.php/What_Should_I_Look_for_If_I_Care_Most_About_Keeping_Spending_Separate%3F

UK players used to rely on phone bill deposits, typically capped at around £30 per transaction. Now, Faster Payments and mobile wallets let users add funds quickly with as little as £10