Browse online dating sites without registering
Well, as you probably guessed, they get tips from those watching.
So, although you can watch for free, you are seeing what you see because some other folks are tipping the performers.
The performers are generally amateur and perform out of their house (although, one cam I saw had 2 girls sitting in a restaurant promising to do public flashing if they got a certain number of tips).
And yes, you can visit the site on your smartphone, but the site isn't mobile responsive so you will just be getting the desktop site on your mobile device - not a great experience as you can imagine.
Some final details that need to be mentioned include the fact that many of the cams aren't HD.
I know with the best of the pay sites you have come to expect almost all HD cams, but these girls are all using their own equipment and cam quality is hit and miss.
The good news is that - of course it is free to browse the cams so a low quality cam doesn't cost you anything.