Rob Pegoraro's post | Latest updates on Sulia
Firefox OS could be a good feature-phone replacement, but only if you throw enough hardware at it.
This Mobile World Congress's most important debut looks to be Firefox OS (http://www.mozilla.org/en-US/firefox/partners/#). An open-source mobile operating system built on Web standards, and for cheap, low-end hardware, could do a lot to upend the business.
Indeed, two of the Firefox OS phones I've seen here, from ZTE and Alcatel One Touch, cater to feature-phone users looking to a cheap upgrade. Each has a small, low-resolution screen and only a back camera. But I suspect the Firefox OS experience will be much better on a larger device like the Peak phone above, the product of Madrid firm Geeksphone; it adds a front camera, offers a larger, sharper screen and looked distinctly snappier when I played with it.