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

https://station-wiki.win/index.php/Can_You_Still_Deposit_at_a_Casino_Using_Your_Phone_Bill_in_the_UK%3F

UK players are moving away from phone bill deposits, which often had low limits like £30 per transaction and slower processing times. Faster Payments allow instant bank transfers with higher limits and better security