A free spin casino bonus is a chance given to mobile slots players to spin the reels on slots games for free. Considering that it is an incentive offered to slots punters, clicking on the free spin button does not affect the player's account balance.
Most mobile casinos offer slots players a free spin bonus. Free spin bonuses are exclusive to specific slots games. Ideally, the primary reason casinos offer this incentive is to give players a chance to familiarize themselves with a new game in its purest form. Free spins are by far the most popular type of casino bonus.