Thousands of tech execs, marketers, reporters and enthusiasts have gathered in Barcelona this week for the Mobile World Congress, the world's biggest mobile trade show for the global wireless industry,held from February 22 to February 25, 2016.

In this photo, a visitor takes a photo of the new LG G5 model of South Korea's LG after its presentation on the eve of the official start of the congress on February 21, 2016.

Founder and CEO of Facebook Mark Zuckerberg (L) and President of Mobile Communications Business of Samsung DJ Koh shake hands during the presentation of the new Samsung Galaxy S7 and Samsung Galaxy S7 edge on February 21, 2016 in Barcelona.

Some of the world's largest communication companies are unveiling their last phones and gadgets.

Facebook CEO Mark Zuckerberg made a surprise appearance at the Samsung press conference in Barcelona to talk about virtual reality technology, calling it the "the most social platform," on February 21, 2016.

Facebook bought Oculus for approximately $2 billion in 2014 and is working with Samsung on Gear VR headsets.

Visitors test a car with internet connection during on the second day of the Mobile World Congress in Barcelona on February 23, 2016.

The Mobile World Congress is a major event for Barcelona, that runs through February 25, earning the city some 436 million euros ($482 million) last year.

Founder and CEO of Facebook Mark Zuckerberg speaks during the presentation of the new Samsung Galaxy S7 and Samsung Galaxy S7 edge on February 21, 2016 in Barcelona, ahead of the official start of the congress.

A man tests the Oculus VR virtual device on the stand of Deutsche Telekom on the second day of the Mobile World Congress in Barcelona on February 23, 2016.

A man tests an application to shop remotely during the second day of the Mobile World Congress in Barcelona on February 23, 2016.

A visitor takes a picture to a dog with a locating collar during on the second day of the Mobile World Congress in Barcelona on February 23, 2016.

Visitors check new ZTE devices on opening day at the Fira Gran Via Complex on February 22, 2016 in Barcelona.

The new Samsung S7 smartphone is displayed after its unveiling ceremony in Barcelona, February 21, 2016.

People visit the ZTE pavilion on opening day of the congress on February 22, 2016.

A visitor takes a picture of the Gear 360 camera at the Samsung stand on the first day of the congress in Barcelona on February 22, 2016.

South Korean tech giant Samsung Electronics unveiled its first 360 degree camera February 21, its latest push into new areas as it seeks to generate additional income at a time of slowing smartphone sales.

Richard Yu, CEO of Chinese multinational networking and telecommunications equipment and services company Huawei, presents accessories for the new Matebook during a press conference before the start of congress on February 21, 2016.

Visitors test the new 'Oculus VR' virtual device at the Samsung stand during the Mobile World Congress in Barcelona on February 22, 2016, the first day of the world's biggest mobile fair.

South Korean tech giants Samsung Electronics and LG unveiled new smartphones with better cameras and turned to virtual reality to boost interest in their headsets at a time of slowing sales.

Samsung's Mobile Communications Business chief DJ Koh speaks during a press conference presenting the company's new Galaxy 7 mobile device, on the eve of the official opening of the Mobile World Congress in Barcelona on February 21, 2016.

Vice President and Head of Mobile Products at Samsung Electronics America, Justin Denison speaks during a press conference to present Samsung's Galaxy 7 new mobile device on February 21, 2016.

Visitors check HTC mobile phones on the second day of the event at the Fira Gran Via Complex of the Mobile World Congress on February 23, 2016 in Barcelona.

Journalists work during the Samsung S7 and S7 edge worldwide unveiling on February 21, 2016 in Barcelona.

Ericsson's President & CEO Hans Vestberg shows a 5G chip during a news conference at the congress, February 22, 2016.

The new Sony Coporation device "Xperia Eye Concept" is displayed at the Mobile World Congress in Barcelona on February 22, 2016, on the first day of the world's biggest mobile fair that runs to February 25.

President of Sony Kazuo Hirai speaks during the official unveiling of the new Sony Xperia X device on opening day of the congress at the Fira Gran Via Complex on February 22, 2016 in Barcelona.

Chinese electronics giant Huawei yesterday unveiled its first personal computer MateBook, a convertible tablet aimed at the premium business market that will compete with Apple's iPad Pro and the Microsoft Surface.

A woman tests Huawei's new Matebook at the Mobile World Congress in Barcelona on February 22, 2016.

Mark Fields, President and CEO of Ford, delivers a keynote speech during the Mobile World Congress in Barcelona, February 22, 2016.

Fields said the company would triple its engineering investment for driver assist technology.

Ford is using the fair to unveil the new Kuga SUV and also announce its SYNC 3 connectivity technology.

Visitors look at the new Samsung Galaxy S7 on the opening day of the congress at the Fira Gran Via Complex on February 22, 2016 in Barcelona.

People wear Samsung Gear VR devices as they attend the launching ceremony of the new Samsung S7 and S7 edge smartphones in Barcelona, February 21, 2016.