Not an issue if you don't have access to the Cash App phone number at the time of login. Say thanks to the Cash App login process which is quite flexible and convenient. Always remember that you must have access either to your phone number registered with Cash App or email id. So, if you don't have access to your phone number, you simply can use your Cash App email id to receive the Cash App login code. That's all you need to do. Rest of steps for Cash App login are the same. Just open an app and tap the sign and get a secret login code. If you don't receive a sign code, tap the help button and select send me code again.