Yes, you can log in to your existing Testerup account on a different device by using the same login method you originally used to create your account.
However, please ensure that you finish any offers you started on your old device, as you cannot continue them on the new one.
You may start new offers on the new device, but avoid switching between devices when participating in an offer, as it can only be tracked on one device.
Lastly, make sure that your new device’s operating system is up-to-date.