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

https://andressinspiringthoughtss.theglensecret.com/why-does-my-casino-ask-for-a-different-withdrawal-method-than-my-deposit-method

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