I'd probably fire up Google Maps which comes pre-installed on all Android phones and use the coordinates to tell someone where I was. Saves both of us having to download an extra app.
How would you describe exactly where you are on a long stretch of road with no road signs or landmarks? 
Download the what3words #app in case of instances just like this 
http://qtrh4.app.goo.gl/TWB #RoadSafetypic.twitter.com/8NnFQroaX8
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Communicating coordinates can be prone to error, especially when saying them over a phone. Even if a 3 word address is misheard, our system will suggest a more appropriate one. And you don't even need to have the app! Sent from http://what3words.com/filled.count.soap …pic.twitter.com/liHF3VHt2A
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