I have an Android device:
- Mezu is not available if your version is lower than Lollipop 5.0.
- To check your Android OS version: go to Settings > System > About phone (usually, it's one of the last options)
I have an Apple device:
- It can be used only on iPhone 4s or later.
- Mezu is not available if your iOS version is lower than 9.3.
- To check your iOS version: go to Settings > General > About > Version
I have another device:
- At the moment, Mezu is not available on your device.