Sony unveiled a new waterproof phone that can take ultra-high-definition video. Nokia introduced three Android smartphones aimed at emerging markets. And Lenovo announced one with an all-glass exterior.
Yet most of the attention will be on Samsung, which on Monday evening is expected to announce a successor to its flagship Galaxy S4 smartphone. That's bad news for all the other phone makers trying to get noticed at the Mobile World Congress wireless show, which opened Monday in Barcelona, Spain.