A sign-up bonus refers to an offer that casino gives to new customers once they sign up on their site. Casinos use these bonuses to attract new customers and provide them with some funds to start betting. Sign-up bonuses are not withdraw-able and should be used within a timelimit, depending on the casino.
South Sudan is among the youngest countries in the world, having seceded from Sudan only in 2011. Currently gambling is not regulated due to the serious political instability, and it is not clear whether mobile casinos are legal. That being said, there is little to no access to internet, which impacts mobile gambling.