Your cellphone number is often even more useful than a Social Security number because it is tied to so many databases and is connected to a device you almost always have with you.
http://www.nytimes.com/2016/11/13/bu...pagewanted=all
To people who ask for my phone at the cash register or other unimportant places - I just give my old landline number that was disconnected ... in last century...
You can also add a second ph# (free)
https://www.sideline.com/
BTW: read this too:
http://www.nytimes.com/2016/11/16/us...pagewanted=all