UK players have moved from phone bill deposits, which often had limits like £30...

https://quebeck-wiki.win/index.php/Why_Did_Phone_Bill_Deposits_Have_Such_Low_Limits_in_the_UK%3F

UK players have moved from phone bill deposits, which often had limits like £30 per transaction, to Faster Payments and mobile wallets. These newer methods let you deposit as little as £10 quickly and securely, without waiting on phone carriers