What this login device management sees is the login time status of your last mobile phone, which refers to what device your current account is logged in, not that this mobile phone was used a few years ago.

Login synchronization history means that the records of the same login account can be displayed on different computers on the Internet. You can know which websites users have visited by viewing the history, and you can browse the history by clicking the history icon in the toolbar above the browser.

In the browser, history refers to the temporary information of websites visited by the browser in the computer, and login synchronization history means that the records of the same login account on the Internet can be displayed on different computers. You can know which websites users have visited by viewing the history, and you can browse the history by clicking the history icon in the toolbar above the browser. The history of Netscape Browser can be viewed by selecting History in Tools.