UK players used to top up casino funds via phone bill deposits, often limited...

https://wiki-wire.win/index.php/How_Do_I_Keep_Casino_Deposits_Off_My_Main_Bank_Statement%3F

UK players used to top up casino funds via phone bill deposits, often limited to around £30 each time. Today, Faster Payments and mobile methods let users move money quickly and securely, with minimum deposits as low as £10