Making money on your phone is quite easy. If you download an app of the likes of KK Cash, you'll be able to do so whilst you're having fun, playing any of its dozens of games. With the money you earn, you can purchase gift cards on Amazon and Google Play or have the money paid straight into your PayPal account.
Make money while you play
Here you'll find different games such as the roulette or matching pairs of cards hidden on a panel, amongst others. These games will provide you with money that will be applied to your profile and which you exchange for gift cards or cash paid into your PayPal account.
These applications make money through advertising, therefore, you should be warned that you're going to have to put up with loads of ads. However, if you're patient enough, you can see how easy it is to make a few euros that you can spend on shopping. Nevertheless, each game has a daily profit limit, therefore, you'll have switch games if you want to become disgustingly rich.