UK players used to rely on phone bill deposits, which often had low limits like...

https://ericksuniquedigests.trexgame.net/why-did-phone-bill-deposits-feel-safer-than-cards-on-early-smartphones

UK players used to rely on phone bill deposits, which often had low limits like £10 and could take time to process. Now, Faster Payments and mobile wallets let users move money instantly, usually without hidden fees