On Tue, Jun 30, 2015 at 4:07 PM, Jon Robson <jrobson@wikimedia.org> wrote:

_If you need help with making your campaigns mobile friendly or are
unsure how to do so_... please do reach out to us on the mobile-l
mailing list ahead of running these campaigns

Mobile-l is probably not the most effective place for this warning :)

https://meta.wikimedia.org/wiki/Help:CentralNotice does not have anything about mobile, I would start there.