Cash app customer service number - contact Cash app by phone If you are here without a doubt you must be having some technical errors in your Cash app account due to which you may not be able to conduct online transactions through the Cash app. Cash app customer service number - -800-969-1940 available 24/7 to provide you quick and effective solutions to all your problems. You can dial this number and report your issues. You can go through the link here to acquire more information on Cash app support. https://www.contactcustomer-service.co/phone-number/Cash-app