UK players used to top up casino accounts via phone bill, often capped at...

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

UK players used to top up casino accounts via phone bill, often capped at around £30 per transaction. Now, Faster Payments and mobile wallets offer quicker, smoother deposits with lower minimums, sometimes as little as £10