If someone connects to your wifi router from their phone can you find out their phone number?

[xbex11]

Is it actually possible to find out someone´s number if they are connected to your wifi router from their android phone?
else how much info can be found from their connection?

Thanks

 

[greens]

Is it actually possible to find out someone´s number if they are connected to your wifi router from their android phone?
else how much info can be found from their connection?

Thanks

MAC address, which is a unique device specific string. but that is pretty useless.

aaand that is about it! Well, depending on your router you can of course monitor what sites they visit.

But no, no phone numbers.