#What Doesn't Work

Some features and libraries are not supported on Meta Horizon OS.

#Mobile-Specific Hardware

These hardware features don't exist on Quest:

• SMS: No cellular connectivity
• Telephony: No phone calling capabilities
• GPS hardware: No GPS chip (WiFi/IP location only)

#Google Mobile Services

Meta Horizon OS doesn't include Google Mobile Services (GMS). Libraries that depend on GMS won't work:

#Google Services

• Google Authentication: Use Meta authentication or alternatives
• Google Maps: Not available
• Google Play Billing: Use Meta Horizon Billing SDK instead
• Google Cloud Messaging: Not supported

#Firebase

Firebase modules tied to Google Play Services won't work:

• Firebase Cloud Messaging (FCM)
• Firebase App Check (when using Play Integrity)
• Some Firebase Analytics features

See Firebase documentation for details.

#Restricted Permissions

Some Android permissions are prohibited on Meta Horizon OS:

• Dangerous permissions: INSTALL_PACKAGES, etc.
• Irrelevant permissions: CALL_PHONE, etc.

See Meta's prohibited permissions list.

The expo-horizon-core plugin automatically disables these permissions.

#Unsupported Dependencies

Check Meta's unsupported dependencies list for libraries that won't work.

#Alternatives

For features that don't work, consider:

• Billing: Use expo-iap with Meta Horizon support
• Notifications: Use expo-horizon-notifications
• Location: Use expo-horizon-location (limited accuracy)
• Maps: Use web-based map solutions or custom implementations
• Authentication: Use Meta authentication or OAuth providers

#Checking Compatibility

Before adding a library:

1. Check if it depends on Google Play Services
2. Verify it doesn't require prohibited permissions
3. Test on a Quest device
4. Look for Quest-specific alternatives