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

https://source-wiki.win/index.php/Why_Did_Casinos_Stop_Letting_Me_Deposit_by_Phone_Bill%3F

UK players used to rely on phone bill deposits, often capped at around £30 per transaction. Now, Faster Payments and modern mobile methods let users deposit as little as £10 and see cash hit their accounts in seconds