Take Some Important Photos
This tip is more about using your phone to prepare for your trip than preparing your phone; nonetheless, it belongs on your to-do list. Prepare a digital backup in case your identification gets lost or stolen. With your camera phone, take a photo of your passport or driver's license, and email the photo to yourself. You might also want to take a photo of the contents of your checked bag, which may come in handy if the airline loses your luggage. (Use the photo to help document your missing belongings when filling out a claim form.) Throughout your trip, take advantage of the camera on your phone and snap photos of anything that might serve as a helpful reminder, from your airport parking-lot spot to your hotel-room number.
But first, you need to ensure that you have space on your phone to store such images, which brings us to our next tip.