The Samsung Galaxy S5, with heart rate monitor and some<a href="index.php?page=&url=http%3A%2F%2Fmoney.cnn.com%2F2014%2F02%2F24%2Ftechnology%2Fmobile%2Fsamsung-galaxy-5-hands-on%2F"> new, high-spec features</a>.
Top trends from Mobile World Congress —
The Samsung Galaxy S5, with heart rate monitor and some new, high-spec features.
courtesy samsung
The new<a href="index.php?page=&url=http%3A%2F%2Fmoney.cnn.com%2F2014%2F02%2F24%2Ftechnology%2Fmobile%2Fnokia-x-android%2F"> Android-powered</a> <strong>Nokia X</strong> range.
Top trends from Mobile World Congress —
The new Android-powered Nokia X range.
Jim Spellman/CNN
Facebook CEO <strong>Mark Zuckerberg</strong> talks about the <a href="index.php?page=&url=http%3A%2F%2Fmoney.cnn.com%2Fvideo%2Ftechnology%2F2014%2F02%2F24%2Ft-zuckerberg-on-whatsapp-acquisition.cnnmoney%2F">$19bn takeover of WhatsApp</a>.
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Facebook CEO Mark Zuckerberg talks about the $19bn takeover of WhatsApp.
Josep Lago/AFP/Getty Images
Russia's YotaPhone showed off an Android handset with an <a href="index.php?page=&url=http%3A%2F%2Ftechland.time.com%2F2013%2F01%2F09%2Fhands-on-with-russias-yotaphone-finally-something-different%2F" target="_blank" target="_blank">interactive e-ink display</a> on its back.
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Russia's YotaPhone showed off an Android handset with an interactive e-ink display on its back.
Courtesy Yota Devices
In addition to the Galaxy S5, Samsung announced the Gear2 watch, which <a href="index.php?page=&url=http%3A%2F%2Fmoney.cnn.com%2F2014%2F02%2F23%2Ftechnology%2Fmobile%2Fsamsung-gear-2-smartwatch%2F">ditches the Android OS</a>.
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In addition to the Galaxy S5, Samsung announced the Gear2 watch, which ditches the Android OS.
David Ramos/Getty Images
Samsung Gear 2, right, and at the Samsung Gear Fit. Like the Galaxy S5 smartphone, they came with the new ability to constantly monitor your heart rate, making them far more useful as training aids.
Top trends from Mobile World Congress —
Samsung Gear 2, right, and at the Samsung Gear Fit. Like the Galaxy S5 smartphone, they came with the new ability to constantly monitor your heart rate, making them far more useful as training aids.
AP Photo/Manu Fernande
WhatsApp's co-founder Jan Koum announced<a href="index.php?page=&url=http%3A%2F%2Fwww.cnn.com%2F2014%2F02%2F24%2Ftech%2Fmobile%2Fwhatsapp-voice%2F"> the arrival of voice calls on the service</a>.
Top trends from Mobile World Congress —
WhatsApp's co-founder Jan Koum announced the arrival of voice calls on the service.
David Ramos/Getty Images