Howdy Andy,
Thank you very much for reporting this. I will have to track down someone on the team with that phone to try an reproduce the issue, so we can then fix it ASAP. So far every other phone we’ve tested with has worked fine.
In the mean time are you seeing this same issue on any other site in our showcase? If not, then this would seem to be an issue with our custom theme and not the calendar itself. You should be able to safely run the plugin on your site without issue.
Thanks again!