UK players are moving from phone bill deposits, which often charged £30 or more...

https://reliabless.com/how-do-i-keep-casino-deposits-off-my-main-bank-statement/

UK players are moving from phone bill deposits, which often charged £30 or more per transaction, to Faster Payments and mobile wallets. These newer methods let you deposit as little as £10 instantly, with lower fees and better security