In most cases, in the general terms and conditions of any online casino, you must almost always use the same method to withdraw funds deposit method in the first place. You probably do not want to add £500 credit to your phone bill you will be looking for other options. Whilst you may be able to deposit via your phone bill or top-up credit, and as discussed, to only a limited amount, if you were to have a significant win or large balance you wanted to withdraw, then comes the next problem. Making Withdrawals by Phone Bill on Casino is Not So Easy That's not altogether a bad thing to keep your spending in check.
The Pros of ease and convinience outweigh the slight con of low maximum deposits.