UK players used to top up casino accounts through phone bill deposits, often...

https://www.bookmarking-maze.win/uk-casinos-are-moving-away-from-phone-bill-deposits-because-of-high-fees-and

UK players used to top up casino accounts through phone bill deposits, often limited to around £30 per transaction. Now, Faster Payments and mobile methods offer quicker transfers and lower minimums, sometimes just £10