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I'd say my favorite apps, or iPhone usage in general, is anything Communication Related. Here is a picture of me on facetime with some friends / colleagues. I'm a student that travels ALOT and I try to balance friends, family, and freelance. Facetime and Skype is a great asset.
My most used and #1 go2 app is google's Google Voice app. This has been a savior for setting up a faux 'business phone' for clients and whatnot.
It'd be interesting to see how Vonage's new app will live in this nest of communication apps.
