Most used application?

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With the millions of applications that you can download for your smartphone, I was just curious about what you use the most? This doesn't count the pre installed ones. Because in that case, messeging or the hotspot are probably my most used ones. Currently facebook is probably my most used app, but that is because I have a writing gig for the time being that involves facebook. So, how about all y'all, what downloaded app do you use the most of?