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

https://planetfitnessprices.com/how-mobile-casino-deposits-have-evolved-from-phone-bills-to-instant-transfers/

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