This Suggestion has been reviewed by our staff. Presently, there are no plans for taking further action
Is it possible to make the members join by using a mobile number instead of email?
This would allow push notifcations and easier integration to software like TELEGRAM
Not at this time. The current code allows for logins by ID, nickname or email. Mobile number is not a default profile field. It can be made to work that way via code modifications.
I have future plans for what are called web push notifications. They are however not the same as mobile app push notifications.
It is actually impossible for a website to send push notifications directly to a mobile device without a app or in the case of a web push notifications, a browser running.