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Headers in Flask

I can get the ip addresses using the headers ,can someone please help me to get the phone number . I am building a web app to in which certain people get to see different content , and I want to identify them using their phone number. And what should be the syntax?

Or can I even do this?

I'm pretty sure that phone number is not automatically sent in the headers. Not least because in most situations, requests come from things where phone number is meaningless.