You can register by using your mobile number and verify with OTP, You will see all the contacts, which are registered on server, you can video call to any one.

This app focused on security and low internet data usage. With Hello Drish App, you have access to a world of communication.

Hello Drish app internally use agora sdk for video call https://www.agora.io/en/

Hello Drish App will help you to be in touch with your friends and family.