UK players used to deposit casino funds via phone bills, often capped at £30...

https://sergiosbestnews.cavandoragh.org/why-do-casinos-say-deposits-are-instant-but-my-balance-updates-slowly

UK players used to deposit casino funds via phone bills, often capped at £30 per transaction. Now, Faster Payments and modern mobile options let them add money quickly and securely, with minimum deposits as low as £10