A trusted device is a mobile we know is yours and that can be used to verify your identity by displaying a notification from Soldo when you log in to the web console or make some payments.
Therefore, for security reasons, you are allowed to have one trusted device at the time.
If you wish to replace it, all you need to do is download and install the app on the new device. The system will recognise that you logged in from a different mobile phone and will ask you if you want to replace it.