I tried another template but the problem remains.
Maybe it´s a general mobile problem!?

I installed and set up Ionospere from Rockettheme (Mar 2012)
Demopage

But the problem is the same:
The mobile theme works but booking is not possible. I can not click into the calendar for start and end date. :-(

If you don´t have a IPhone this may help you to get a view on it:

Electric Mobile Simulator
Download-Link
Scroll down there is a free lite version!

As you are already registered on the site, login with the simulator and try to click into the calendar.

Thanks for any help!

Edit:

Surpisingly now it works with Ionospere!

Anyway this may help you to find a possibility to solve this problem with the gavik template!?
Or do I have to rebuild the template?

Hello, we tested component only with PC. Mobile phones aren't still supported.