Mobile data option not visible

Hi Rohansharma9,

It sounds like you're looking to activate your iPhone with a different carrier. First, you'll need to ensure your device is unlocked by your current carrier. The steps below found in the article here can assist: How to unlock your iPhone for use with a different carrier - Apple Support

"Contact your carrier

1. Only your carrier can unlock your iPhone. Contact your carrier and request an unlock. Your account might need to meet requirements for unlocking. After you submit the request, it might take a few days to complete. Contact your carrier to check the status of your unlock request.
2. After your carrier confirms that they unlocked your iPhone, follow the steps below. "

Find information about using dual SIM here: Using Dual SIM with an eSIM - Apple Support

You can also view a list of carriers that support eSIM here: Find wireless carriers and worldwide service providers that offer eSIM service - Apple Support

Cheers.