Firefox OS Smartphone, New Tablets Star At MWC 2014

While tradeshows are no longer the place to announce new products -- manufacturers tend to release them at their convenience -- the annual Mobile World Congress in Barcelona sometimes proves the outlier, with a number of different mobile and other announcements that set the stage for the rest of the year.

On one end of the spectrum from this year's showcase, the likes of Sony and Samsung are releasing new high-end devices aimed at power users and wealthy markets. On the other end, Nokia and Firefox are introducing the next generation of low-cost feature phones and smartphones, aimed at cost-conscious consumers and emerging markets.