Open the app at the same time, different multi devices have to show different information ?

How to Open apps at the same time to be different, for example, mobile phone 1 logs in and shows Jon’s name, mobile phone 2 enters the app and doesn’t show Jon’s name because he hasn’t logged in yet. must be logged in Don’t be like mobile phone 1, like using this app for many people at the same time ?
Now I can only Logged in and named Jon and opened another app, it showed Jon’s name, so I wanted him to log in first because it was a different device. Thanks.

Store the logged in users in an online database

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