I looked at a live video show on net with VPN. The girl on the other side called my real name, which I never revealed on dating site. Why?

I clicked over a video. My name and other details are hidden. I use VPN. I use different name. But SIM card is on my real name. Do you feel she can read my name by SIM card? I am puzzled

2017-04-11T00:37:33.809Z