Part of it will depend on whether or not your phone's browser supports Flash or not. I can watch MFC and CB on my phone, but not broadcast using Chrome. I think Puffin and Opera support Flash. Please, don't quote me on that because I could be wrong. I've never tried broadcasting from either of them.
The other part will depend on your phone's cell service. I've used my phone as a hot-spot before and had issues with my connection cutting out. And I wasn't somewhere with bad service! I had 5 bars of 4G LTE. FWIW, I'm with AT&T.
Personally, I wouldn't recommend camming from a phone. I feel like the website would be hard to navigate + the issues above.