Depending on your mobile device, there are multiple different versions of mobile casinos. The browser based casinos are the most popular. This is where a gambler may access the casino of their choice directly through a browser that is built into their phones or tablets. The casino then uses the browsers capability to allow them access to the online casino that they have chosen to use. This is the most popular as it takes no time at all to set up and is basically installed whenever you buy a phone.