UK players have moved from using phone bill deposits, which often had limits...
https://www.cool-bookmarks.win/uk-players-used-to-rely-on-phone-bill-deposits-to-fund-their-casino-accounts-1
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