UK players are moving away from phone bill deposits, which often had limits...

https://wiki-wire.win/index.php/Why_Could_You_Not_Withdraw_to_a_Phone_Bill_Deposit_Method%3F

UK players are moving away from phone bill deposits, which often had limits like a £30 max per transaction. Instead, they prefer Faster Payments and mobile wallets that let them deposit as little as £10 instantly