8 of 8Image
The Skype iPhone app will have you making calls around the globe with little fuss, and without picking up the bill for high roaming charges. The free application allows you to use a Wi-Fi or data connection to connect and make video or voice calls with other Skype users, or you can pay for a Skype number to make calls to standard cells.
The TripAdvisor app is a popular way to save some cash, find out where the best tourist attractions and restaurants, how best to travel between place to place and to book cheap hotels and flights. The most useful feature I find to be is the forums, where you can seek honest advice about your travel plans.