8. Samsung Galaxy S
Samsung announced the Galaxy S in March 2010. The phone featured a 1 GHz Samsung Hummingbird processor and was available with up to 16 GB of internal storage. It also had a microSD slot that supported up to 32 GB of external storage. The Galaxy S had a 4-inch display, a 5 megapixel camera in the back and a front-facing 0.3 megapixel camera. As of January 2011, Samsung had sold 10 million Galaxy S smartphones worldwide. The Galaxy S shipped with Android 2.1. Samsung started rolling out upgrades to Android 2.2 Froyo in November 2010.