At many of the iPhone casinos that are available to American players, you can play your favorite slots machine without spending a single cent. For many skeptics out there, this might sound like something that is hard to believe. But no deposit slots machines are a massive industry in and of themselves, and many US players enjoy the excitement that can be had on a daily basis. The top mobile casinos like offering their players with a variety of choices, and one of these choices is whether to play the real money slots machines, or the no deposit slots machines which are completely free.