If you log in to another phone, you can still use the account to access the information and files of the original phone. This is because most applications support multi-device synchronization, which means that the application can sync data to multiple devices without having to create a new account on each device. For example, if you log into a website or application on your phone and log into the account again on another phone, the data on the original phone will be automatically synchronized to the new phone, including bookmark, favorites, browsing history, etc. Therefore, even if he logged into a different device, the data on the original phone could still be accessed and retained. However, it should be noted that some applications may limit multi-device synchronization or may incur additional fees or data consumption when syncing data. Therefore, before deciding to use multi-device synchronization, make sure you understand the limitations and cost information and choose the application that suits your needs.