Can Someone Hack Your Cash App With Your Username? If you need to know about this then consider dialling the cash app helpline number. This cash app number is available 24 hours so that you can speak to the experts about your issues. With customer support, you will get technical aid for rectifying the problems of your cash app. Also, you can get answers to these questions by dialling the helpline number. Make sure to ask your queries direct to the support team anytime.