Mobile World Congress day one: A smartphone diary

The world's biggest mobile technology event is underway in Barcelona.

Several big companies including Samsung, Huwawei and Nokia have unveiled new handsets.

Many firms are focussing on cheaper, more basic phones aimed at people in developing countries.

Wearable technology is also a major theme of this year's Mobile World Congress.

Newsbeat's technology reporter Jonathan Blake shows us around on day one.

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