I had posted a month or so ago about image galleries not working properly in mobile sites. I see that this latest version has fixed that, however the images are still just too small.
I do not use the Jetpack mobile theme because it can not handle the header image from custom themes.
Please look at this gallery on an iPhone to see how you can only get the thumbnail. http://redigitalservices.com/17lizann/photos/
Also, please look at how these same images are handled on a site without Jetpack, with the NextGen gallery and the Photoswipe plugin. This is handled perfectly and I hope Jetpack can soon be able to do this.