I have three mobile devices, Samsung Galaxy S2 phone, Samsung Galaxy Tab 2 10.1 tablet and very recently Samsung Galaxy Tab 3 8.0 tablet and I can't login to ZC on any of them?! The login box comes up but as soon as I hit Username and the keypad appears the login box disappears?! Is this a Samsung thing or a problem with all mobile devices?
Just click on any users name (like under the photos on the home page). It will open up text boxes you can type in on mobile devices
I had this problem on my Samsung as well, it was the S2 micro (or mini) but after some perseverance I managed to log in. I'm not sure what I did or how I managed it but it is definitely possible to do, just make sure that once you've managed it then DON'T log out or you have to go through the whole process again. Sorry if that's not much use but I'm just saying that it's definitely doable on an Android operating system.
It was brought up on another thread too: http://www.zoochat.com/25/what-do-you-use-access-forum-293859/