How often have you been at a library or archive and found something -- but didn't bring the right paperwork with the person in question in it? Of course if you brought and can use your laptop or tablet, you can possibly access your database or online tree(s).  There are phone apps! Some are getting really good. The major sites have them, and there are some standalone apps too - and browser plugins too. While traveling, these apps can be quite useful. Ancestry app Ancestry : two apps. First, for your tree:  https://www.ancestry.com/cs/ancestry-app  and AncestryDNA:   activate your test in the app!  https://www.ancestry.com/cs/dnaapp Ancestry also owns  FindaGrave , which has their own app. Photograph and upload grave photos right from your phone:   https://www.findagrave.com/mobileapp The very latest on the apps from Rootstech: https://www.rootstech.org/video/ancestry-on-the-go-ancestry-app-suite MyHeritage mobile app MyHeritage app is very full-featured,