If you have purchased a new device, simply download the Cash app and login to your existing account with the corresponding email address and password. The funds will continue to be transferred to the bank account linked to your Cash App account. Additionally, Cash App Readers are universal and can be used with any supported device and Cash App account, so there is no need to activate cash app or register them.
If you have multiple locations, you can use the device code to connect mobile devices to specific locations. The device code allows you to log in without an email address and password.