It is not a problem if you have an international number. Instead of texting your Join Code to 735-343 you will text it to this number: (512) 308-3535.
**I might leave the below off.. because not all events can view pics in the app?
Once you have enrolled and downloaded the Waldo Photos app, be sure to turn on Push Notifications. This will turn off text notifications to allow you to receive alerts when your photos have been found. You can do this in the app by tapping the yellow Waldo face in the top left corner of the home screen, and tap Enable Push Notifications.