The iPhone started the whole smartphone trend, all the way back in 2007. It was a game-changer in so many ways. Thin (impossibly thin, according to Steve Jobs), powerful, and just plain fun to use. Since then, smartphones have progressed and evolved almost beyond recognition, and with each generation, are getting even more impossibly thin, powerful, and feature-rich. Apple has steadily held the throne for many years, but is constantly being challenged by other manufacturers and their latest products. The most recent contender is the OPPO R5, which is now ready for pre-order through Amazon and estimated to be delivered on the 20th of February.