UK players used to top up casino accounts using phone bill deposits, typically...

https://www.bookmarking-maze.win/uk-players-used-to-rely-on-phone-bill-deposits-often-capped-at-30-per

UK players used to top up casino accounts using phone bill deposits, typically capped around £30 per transaction. Now, Faster Payments and mobile wallets let them deposit as little as £10 instantly