If you have yet to see the free cash offers that many of the best bingo sites are offering new players and old players if you play via mobile then you must be on another planet because they are absolutely everywhere at the moment. It seems to be the method of choice to make each site stand out from the competition and attract new players.
However, some players have been making complaints about the free cash offers because they are getting nasty surprises.
This is largely because there are restrictions placed on any money you get for free from these sites. After all, it is not technically your money. The trick is to read the small print because you may be limited to using it to play bingo or certain games online. It is also unlikely that you would be able to withdraw any cash you win with your free cash until you have deposited so make sure that you know exactly where you stand with free money to play bingo online.