Ahh. It's responsive, but it use flash to enable microphone right? Well, Google Chrome on Android dont support flash. We can still use our computer or notebook but some people might want to use phone. Anyway, when I read the title, I thought it was a smartphone created purely for Bitcoiner. Also, I did not see a "lock" icon beside the addressbar in Firefox. Not sure if our communication is secure.
You should see a lock, the whole site is under SSL. Notice the https ?
It uses WebRTC in Chrome and Firefox. If WebRTC isn't supported it will default to Flash. If Flash isn't supported, you have to use another phone. This enables the alternate phone where you can dial source phone to connect to target phone..
More info here:
https://bitphone.freshdesk.com/solution/categories/6000012913/folders/6000019521/articles/6000001191-supported-browsers-and-devices