What's your "Don't forget your towel" for your mobile device?

A towel, it says, is about the most massively useful thing an interstellar hitchhiker can have. ~The Hitchhiker's Guide

Hey everybody, it's Towel Day - something definitely those Douglas Adams fans have marked to commemorate some great writing by that man (RIP Douglas!).

A couple of years ago, the +Big Android BBQ even included a towel in their swag (photo courtesy of +Aaron Kasten):

A towel really is a signifier of someone who's ready for just about... anything.

And on this towel day, while I reminisce on missing out on that towel - I'm wondering what are your 'towels' you have for your phone so that you're ready for anything?

Is it Google Translate (i.e. the babelfish), is it a good case to protect it from the Bugblatter Beast of Traal, a playlist to have with you at the beach while you lay down on your towel, Wikipedia app (the Guide)... ?

What do you have on your phone to always be ready?

Source: http://en.wikipedia.org/wiki/Towel_Day

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