Samsung’s Galaxy S4 was always going to be a big seller — probably the best-selling Android smartphone of 2013 — but the Korean company has lost $12 billion in market value due to concerns that the two Galaxy S4 variants that were recently announced will have a detrimental affect on its profit margins.

Brokers are also concerned that the growth prospects for Samsung smartphone business have “dimmed” following rumors of a new iPhone trade-in program from Apple.

Google’s YouTube apps for Android and iOS have helped the company triple advertising sales on mobile in the past six months, the company has said. Mobile ads now contribute an estimated $350 million to YouTube’s revenue, with around a quarter of the site’s 1 billion users accessing videos on smartphones and tablets.

If you’ve got an iPhone, you’re probably glued to it; if you use an Android device, you probably neglect it, at least comparatively. That’s the obvious conclusion to be drawn by new data that shows that iPhone users spend an additional 26 minutes on their smartphone per day than your average Android owner.

Android and iOS managed to grab a whopping 92.3% of all smartphone shipments during the first quarter of 2013, with a total of 199.5 million units sold worldwide. There are no prizes for guessing which of the two platforms grabbed the most market share.

The original Sonic the Hedgehog, which first made its debut on the Sega Genesis back in 1991, is finally available on Android, four years after coming to the iPhone. The title is largely identical to the 1991 release, but it’s been optimized for modern, touch-based devices and offers some exclusive content only available on mobile.