Only one increase can be active at a time. However, the increase can be replaced as often as you like. Before swiping your cash card, make sure that the impulse you apply is active. To unlock a Boost, follow the steps to know how does boost work on cash app. To view them: Touch the cash Card tab on the home screen. Tap on the current Boost or Exchange. Tap an impulse with a lock icon. However, Explore the Card Cash tab to find out how to unlock various bonuses and visit our website.