BARCELONA — Your next Android phone could cost a lot less and yet come with the same “biometric” fingerprint-unlocking security as high-end hardware.

Or you could find yourself paying extra for screen resolution you can’t appreciate and an altered Android interface you don’t need.

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Those were the ups and downs of smartphones at the Mobile World Congress show here, which has seen almost every company connected with the industry besides Apple show up to show off their next round of hardware, software and services.

How strong is that union? Well, it depends...