Yes you can create unlimted number of channels in your account.

Message Marketing works by broadcasting messages to a large number of people. There is also the option to upload photos and videos.

Using the Message Marketing API, organisations may reach out to all of their potential clients. You can create a business profile using the service. As a result, you may send out broadcast messages and engage in two-way conversations with customers.

Yes, it is legal in India, but there is a limitation. One can send out broadcast messages to 256 users at once, not more than that.