UK players used to top up casino accounts using phone bill deposits, often...

https://direct-wiki.win/index.php/What_Replaced_Pay-By-Phone-Bill_Deposits_at_UK_Casinos%3F

UK players used to top up casino accounts using phone bill deposits, often capped at around £30 per transaction. Now, Faster Payments and mobile options let them deposit amounts as low as £10 instantly