Phone numbers have some value as a verification endpoint, but because it's so easy to steal people's mobile phone numbers via Sim jacking, calling the phone com

Phone numbers have some value as a verification endpoint, but because it's so easy to steal people's mobile phone numbers via Sim jacking, calling the phone company and saying Hi. I'm xyz and I have a new SIM card and please transfer my number to me, it happens all the time, mobile phone numbers are not safe for this purpose.