Please contact the store from where you bought the device.
The inscription indicates compliance with safety and quality standards: These standards, including IS 13252 (India), IEC 60950-1 (international), and IS16333 (India), certify that the phone has been tested and meets specific safety and quality requirements.
Therefore, relying solely on this inscription to determine authenticity is not advisable.
Purchase Apple Products from the Apple Online Store, Apple Retail Stores, and many Apple-authorized resellers and wireless service providers. This significantly reduces the risk of getting a counterfeit product.
Apple offers ways to verify the authenticity of your iPhone using its serial number. You can visit the official Apple website (Check Your Service and Support Coverage - Apple Support) and enter your serial number to check if the device is genuine and covered under warranty.