Hi azi - You may want to check the Connection Guide for further information connecting your smartphone. Go to: Source > Connection Guide > Smartphone > Apple AirPlay
You can also adjust AirPlay settings by going to: Settings > General > Apple AirPlay Settings
If you need troubleshooting assistance, please reach out to Samsung Support at: Phone: 1-800-SAMSUNG / Available 8AM - 12AM EST, 7 days a week ^Val