I've just got a wireless IP camera (SANNCE Home Security IP Camera) in my home garage to solve a classic 'external' access garage question of 'did I close the garage door'. 

It's connected to the wifi (fritzbox using WPA2 network key). 

The app associated with the camera (Joylite) shows the camera's view of the garage, live, regardless of what network my phone is connected to (mobile network 4g, my work's wifi etc). I haven't set up any port forwarding.

So I no longer have to head outside to have a look at the garage. 

But the spectre of another problem has arisen: is my camera another netcam that's on the likes of shodan.io and viewable to the world??