Unable to use iMessage and facetime

Hello, Siddharthagautam.

Let's start off by checking the helpful steps in this article: If you can’t turn on or sign in to iMessage or FaceTime - Apple Support. Begin by following these steps:

"Check your device settings

1. Make sure that you’re connected to a cellular data or Wi-Fi network. 
2. If you're using an iPhone, you need SMS messaging to activate your phone number with iMessage and FaceTime. Depending on your carrier, you might be charged for this SMS.
3. Go to Settings > General > Date & Time and make sure that your time zone is set correctly."

"Turn off and restart iMessage and FaceTime

1. Go to Settings > Messages and turn off iMessage.
2. Go to Settings > FaceTime and turn off FaceTime.
3. Restart your device: iPhone, iPad, or iPod touch
4. Turn iMessage and FaceTime back on."

If the issue persists, please continue with the other steps in the article. Let us know if we can help with anything else at all or if this doesn't settle your issue. Thanks and have a fabulous day!