Ten years ago this week, the first Android phone was announced - the T-Mobile G1. No one could have predicted the massive success that Android would eventually become; the OS now has over two billion active users worldwide.

In honor of Android's 10th birthday, we're taking a look at the most important and influential Google-powered phones of the past decade. Every one of these devices redefined Android in some way, by pushing the OS further into the mainstream, introducing design trends, or signaling the start/end of an era.

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