I have only noticed two online bingo sites that are currently offering their new members who join their sites and open an account a free £20 to try out the bingo games before they have to make any kind of a deposit.

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This will give the players the chance to get the feel for the bingo games that will be played and to learn the rules that your chosen bingo game will have attached to it, the two online bingo sites that have this free £20 no deposit required attached to them are;
1. Gamevillage
2. Cyber Bingo

You can always tell a great online bingo site in my opinion in the amount of free cash that they are offering to you if you join, this is because in my opinion it shows that a site is not worried about the excellent features that it has available or they would not give away so much free cash.

The free bingo cash that you will be given at these particular online bingo sites cannot be withdrawn at any time as it is solely to try out the bingo games, you can also not withdraw any of the cash that you win from playing the bingo games with the bonus cash.

These sites are offering their players great amounts of cash along with other sites such as Wow Bingo that is offering new players who join their site a free £15 if they join their online bingo site and open a bingo account.