http://www.operationworld.org/prayer-app/
If this link does not work, please look for the prayer links on the home page. Please also look in the pull down menus.
Google Play App
https://play.google.com/store/apps/details?id=org.missionaldigerati.operationworld&hl=en
Apple App Store
https://itunes.apple.com/us/app/operation-world/id1181609244?ls=1&mt=8