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Must-have new tech releases

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It's the third day of Mobile World Congress (MWC) in Barcelona, and device makers are battling to show off what they hope will be the tech winners of 2015.

The showcase has already been used by Samsung to unveil its latest smartphones - the Galaxy S6 and S6 Edge - in the hope of fighting back against U.S. rival Apple.

And it's not just phones at this year's event - companies are also showing off a vast range gadgets including smartwatches, bicycles and even pet wearables.

Here, CNBC keeps you up to date with the latest product releases as they happen.