Please review the corresponding section in our official documentation:
iOS SDK - Users | iOS SDK | QuickBlox
Android SDK - Users | Android SDK | QuickBlox
Using React Native SDK, you can retrieve a list of users only by ID or full name:
Users | React Native SDK | QuickBlox
Using Flutter SDK, you can retrieve a list of users only by ID, full name, or tags:
Users | Flutter SDK | QuickBlox
Feel free to check our official documentation for more information that will help you to integrate QuickBlox services into your applications / projects or contact our Support team by submitting a ticket if you have any other questions.