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

https://riversexpertop-ed.iamarrows.com/can-you-still-deposit-at-a-casino-using-your-phone-bill-in-the-uk

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