For those who travel often and depend on smartphones as one of the main sources of information, what apps do you use during your travel? I am particularly interested in the budget apps, hotel apps, and restaurant apps. But if you have others you can highly recommend please list them, too including the OS platform (IOS, Android, Windows, or Blackberry) With the wide array of available apps, it can be overwhelming to test each one of those just to figure out what works and what doesn't. I trust actual users like you more than the paid online app reviews. Thanks in advance.