We do not have or use any kind of smart phone - we go online at www.ioverlander.com as I posted above and looked for campgrounds and it showed nothing anywhere near Oaxaca though it did show places we are familiar with in other areas - I must be doing something wrong - or maybe the site was down or something - to my knowledge they show very few of the campgrounds I am aware of. As far as the Church book and traveling to campgrounds to find them closed - we never go anywhere without checking first - if not with them exactly but maybe someone who has been there.