UK players have moved from using phone bill deposits, which often had limits...

https://www.romeo-bookmarks.win/uk-players-used-to-deposit-at-least-10-via-phone-bill-for-casino-games-but

UK players have moved from using phone bill deposits, which often had limits like £30 per transaction, to faster, more convenient options. Modern methods like Faster Payments allow deposits as low as £10, clearing almost instantly