One of the most lucrative games on the casino floor is the slot machine. Its random number generators determine winning combinations and jackpots, making it a popular game for both players and the house. However, there are a few ways that cheaters have found to manipulate these machines. The first way to cheat a slot machine is by manipulating its source code. A man named Ronald Dale Harris used this to his advantage in the 1990s, earning him a huge amount of cash before being caught. Another way to hack a slot is by using a cell phone. Mobile phones enable gamblers to cheat the slots without being detected, but it is a risky practice that requires a lot of planning.