Congolese agents sit in their cubicles as they speak on the phones with their clients, inside the Congo Call Center (CCC) in the Democratic Republic of Congo's capital Kinshasa, July 26, 2016. Picture taken July 26, 2016. REUTERS/Aaron Ross 

Myanmar's State Counsellor Aung San Suu Kyi prepares her headphones as she attends the ASEAN Summit in Vientiane, Laos September 7, 2016. REUTERS/Soe Zeya Tun

Britain Football Soccer - England v Norway - UEFA European Under 21 Championship Qualifying Group Nine - Weston Homes Community Stadium - 6/9/16
England's Nathaniel Chalobah and Ruben Loftus-Cheek before the match
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Members of the audience listen on translation headsets as U.S. President Barack Obama delivers an address at the Lao National Cultural Hall, on the sidelines of the ASEAN Summit, in Vientiane, Laos September 6, 2016. REUTERS/Jonathan Ernst 

Members of the audience listen on translation headsets as U.S. President Barack Obama delivers an address at the Lao National Cultural Hall, on the sidelines of the ASEAN Summit, in Vientiane, Laos September 6, 2016. REUTERS/Jonathan Ernst 

Turkey's President Tayyip Erdogan adjusts earphones during a news conference after the closing of G20 Summit in Hangzhou, Zhejiang Province, China, September 5, 2016. REUTERS/Damir Sagolj 

Turkey's President Tayyip Erdogan adjusts earphones during a news conference after the closing of G20 Summit in Hangzhou, Zhejiang Province, China, September 5, 2016. REUTERS/Damir Sagolj 

Chinese President Xi Jinping adjusts his earphones during his meeting with U.S. President Barack Obama (not pictured) ahead of the G20 Summit at the West Lake State Guest House in Hangzhou, China, September 3, 2016. REUTERS/How Hwee Young/Pool

U.S. Secretary of State John Kerry adjusts his ear phones during a joint news conference with India's External Affairs Minister Sushma Swaraj (not pictured) in New Delhi, India, August 30, 2016. REUTERS/Adnan Abidi 

A Secret Service agents ear piece is pictured as he waits for Republican nominee Donald Trump to speak at "Joni's Roast and Ride" in Des Moines, Iowa, U.S., August 27, 2016. REUTERS/Carlo Allegri 

Britain's Prince William (2nd L), listens on a set of headphones during a visit to a helpline service, as part of a Heads Together campaign in London, Britain, August 25, 2016. REUTERS/Arthur Edwards/Pool 

A Secret Service agent keeps watch as U.S. Republican presidential candidate Donald Trump works the rope line at a post Republican Convention campaign event in Cleveland, Ohio, July 22, 2016. REUTERS/Carlo Allegri 

Radio presenter Chris Evans takes part in a trade during a charity event on the trading floor of BGC Partners in London September 11, 2013. REUTERS/Stefan Wermuth/Files 

A man wears earphones as he prepares his ballot at a polling station before voting in Spain's general election in Madrid, Spain, June 26, 2016. REUTERS/Javier Barbancho

Football Soccer - Iceland v Austria - EURO 2016 - Group F - Stade de France - Paris Saint-Denis, France - 22/6/16 Iceland's Ari Skulason celebrates after the match REUTERS/Darren Staples

U.S. Secretary of State John Kerry adjusts his earphones during a news conference in Vienna, Austria, May 17, 2016. REUTERS/Leonhard Foeger

Cast member Riley Keough takes part in a news conference for the film "American Honey" in competition at the 69th Cannes Film Festival in Cannes, France, May 15, 2016. REUTERS/Yves Herman 

Prime Minister Narendra Modi looks on as Sri Lanka's President Maithripala Sirisena (L) adjusts his earphones during a seminar at the Simhastha Kumbh Mela in Ujjain, India, May 14, 2016. REUTERS/Jitendra Prakash 

Guests use Gear VR virtual reality headsets during a preview session in Hollywood, California September 24, 2015. REUTERS/Mario Anzuoni/File Photo 

Football Soccer - Manchester City v Real Madrid - UEFA Champions League Semi Final First Leg - Etihad Stadium, Manchester, England - 26/4/16
Real Madrid's Cristiano Ronaldo before the game
Action Images via Reuters / Carl Recine
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Football Soccer - Real Madrid Press Conference - Etihad Stadium, Manchester, England - 25/4/16
Real Madrid coach Zinedine Zidane during the press conference
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Football Soccer - Real Madrid Press Conference - Etihad Stadium, Manchester, England - 25/4/16
Real Madrid coach Zinedine Zidane during the press conference
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Football Soccer - Real Madrid Press Conference - Etihad Stadium, Manchester, England - 25/4/16
Real Madrid's Gareth Bale during the press conference
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Football Soccer - Real Madrid Press Conference - Etihad Stadium, Manchester, England - 25/4/16
Real Madrid's Gareth Bale during the press conference
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Palestinian President Mahmoud Abbas listens through headphones during a news conference with Chancellor Angela Merkel (unseen) at the Chancellery in Berlin, Germany, April 19, 2016. REUTERS/Hannibal Hanschke

People test earphones and headphones during the CanJam headphone and personal audio expo in Singapore February 21, 2016. Picture taken February 21, 2016. REUTERS/Edgar Su 

Football Soccer - Paris St Germain Press Conference - Etihad Stadium, Manchester, England - 11/4/16
Paris Saint-Germain's coach Laurent Blanc during the press conference
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Football Soccer - Liverpool v Stoke City - Barclays Premier League - Anfield - 10/4/16
Liverpool's Daniel Sturridge before the match
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German Chancellor Angela Merkel (R) adjust her earphone as she attends a lunch during a joint Franco-German cabinet meeting in Metz, France, April 7, 2016. REUTERS/Vincent Kessler

French President Francois Hollande (R) and German Chancellor Angela Merkel react as they participate in the conclusion of exchanges of the "Cafe du Monde" organized by the Franco-German Youth Office (OFAJ) in Metz, eastern France, April 07, 2016 as part of a joint Franco-German cabinet meeting. REUTERS/Frederick Florin/Pool TPX IMAGES OF THE DAY

U.S. Secretary of State John Kerry untangles his earphones as he arrives to speak to reporters ahead of the Gulf Cooperation Council (GCC) Ministerial meeting in Manama, Bahrain April 7, 2016. REUTERS/Hamad I Mohammed 

Commuters watch videos on their mobile phones as they travel in a suburban train in Mumbai, India, April 2, 2016. With smartphone sales booming and India preparing for nationwide 4G Internet access, India's film and TV industry hopes the ease of tapping your phone for the latest release will generate profits at last, overcoming the problems of woefully few cinemas and rampant piracy. Picture taken April 2, 2016. REUTERS/Shailesh Andrade 

A man watches a video on his mobile phone as he commutes by a suburban train in Mumbai, India, March 31, 2016. With smartphone sales booming and India preparing for nationwide 4G Internet access, India's film and TV industry hopes the ease of tapping your phone for the latest release will generate profits at last, overcoming the problems of woefully few cinemas and rampant piracy. Picture taken March 31, 2016. REUTERS/Shailesh Andrade 

Turkish President Tayyip Erdogan removes his ear piece at the Brookings Institute in Washington March 31, 2016. REUTERS/Joshua Roberts 

Football Soccer - Ukraine v Wales - International Friendly - NSK Olympiyskiy Stadium, Kiev, Ukraine - 28/3/16
Wales' Ashley Williams before the match
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German Foreign Minister Frank-Walter Steinmeier adjusts his earphones as he attends a news conference after a meeting with his Russian counterpart Sergei Lavrov in Moscow, Russia, March 23, 2016. REUTERS/Sergei Karpukhin 

German Foreign Minister Frank-Walter Steinmeier holds earphones as he attends a news conference after a meeting with his Russian counterpart Sergei Lavrov in Moscow, Russia, March 23, 2016. REUTERS/Sergei Karpukhin 

A detainee watches television while being held in Joint Task Force Guantanamo's Camp VI at the U.S. Naval Base in Guantanamo Bay, Cuba March 22, 2016. REUTERS/Lucas Jackson 

Britain's Harry Redknapp, new manager of the Jordan national team, speaks during his joint news conference with Jordan's Prince Ali Bin Al Hussein, chief of the Jordan Football Association, in Amman, Jordan, March 22, 2016. REUTERS/Muhammad Hamed 

Britain's Harry Redknapp, new manager of the Jordan national team, attends his joint news conference with Jordan's Prince Ali Bin Al Hussein, chief of the Jordan Football Association in Amman, Jordan, March 22, 2016. REUTERS/Muhammad Hamed 

People sit and stand near a Wi-Fi hotspot in Havana, March 17, 2016. REUTERS/Ueslei Marcelino

Football Soccer - Hull City v Nottingham Forest - Sky Bet Football League Championship - The Kingston Communications Stadium - 15/3/16
Eric Lichaj of Nottingham Forest wearing Frozen headphones before the game
Mandatory Credit: Action Images / Ed Sykes
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Football Soccer - Hull City v Nottingham Forest - Sky Bet Football League Championship - The Kingston Communications Stadium - 15/3/16
Eric Lichaj of Nottingham Forest wearing Frozen headphones before the game
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Football Soccer - Liverpool v Manchester City - Barclays Premier League - Anfield - 15/16 - 2/3/16
Liverpool's Roberto Firmino
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EDITORIAL USE ONLY. No use with unauthorized audio, video, data, fixture lists, club/league logos or "live" services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. Please contact your account representative for further details. 

U.N. Secretary General Ban Ki-moon and German Chancellor Angela Merkel adjust their earphones as they address a news conference at the Chancellery in Berlin, Germany, March 8, 2016. REUTERS/Fabrizio Bensch 

U.N. Secretary General Ban Ki-moon and German Chancellor Angela Merkel adjust their earphones as they address a news conference at the Chancellery in Berlin, Germany, March 8, 2016. REUTERS/Fabrizio Bensch 

Valerie Bony, 48, a BBC journalist, poses for a photograph in Abidjan, Ivory Coast, March 5, 2016. Women have long played a dominant role in agriculture in Ivory Coast and in the sprawling markets where most Ivorians purchase their daily necessities. Now some are breaking through into the most important positions in government, administration and business - positions long held by males in this traditional society. In 2012, Niale Kaba became finance minister, the first woman to hold the post in more than half a century as an independent nation. Ivorian women today work in a range of jobs – from gas-station attendant to plastic recycler and lawyer. International Women's Day is marked on March 8. REUTERS/Thierry Gouegnon SEARCH "THE WIDER IMAGE" FOR ALL STORIES 

German Chancellor Angela Merkel adjusts her earphones as she addresses a news conference following her talks with Croatian Prime Minister Tihomir Oreskovics at the Chancellery in Berlin, Germany, March 1, 2016. REUTERS/Fabrizio Bensch 

Croatian Prime Minister Tihomir Oreskovics (L) and German Chancellor Angela Merkel adjust their earphones as they address a news conference at the Chancellery in Berlin, Germany, March 1, 2016. REUTERS/Fabrizio Bensch 

European Council President Donald Tusk takes part in a plenary session of the European Parliament in Brussels February 24, 2016. Tusk told the European Parliament on Wednesday that a deal struck by EU leaders last week to help keep Britain in the bloc is "irreversible" and cannot be annulled by EU judges. REUTERS/Yves Herman 

World Bank's President Jim Yong Kim listens to a question from the media during a news conference after the Vietnam report 2035 launching ceremony in Hanoi February 23, 2016. REUTERS/Kham 

Williams Formula One driver Felipe Massa of Brazil adjusts his earphones during the first testing session ahead of the upcoming season at the Circuit de Barcelona-Catalunya in Montmelo, Spain, February 22, 2016. REUTERS/Sergio Perez 

Football Soccer - Paris St Germain v Chelsea - UEFA Champions League Round of 16 First Leg - Parc des Princes, Paris, France - 15/16 - 16/2/16
Paris St Germain's Kevin Trapp
Action Images via Reuters / Lee Smith

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Telekom Austria CEO Alejandro Plater listens during a news conference in Vienna, Austria, February 10, 2016. REUTERS/Heinz-Peter Bader TPX IMAGES OF THE DAY 

Republican U.S. presidential candidate businessman Donald Trump has ian earpiece put in before a TV interview in the spin room after the Republican U.S. presidential candidates debate sponsored by ABC News at Saint Anselm College in Manchester, New Hampshire February 6, 2016. REUTERS/Carlo Allegri 

European Council President Donald Tusk attends the 'Thermatic Pledging Session' at the donors Conference for Syria in London, Britain February 4, 2016. REUTERS/Ben Stansall/pool 

European Central Bank President Mario Draghi adjusts his earphones as he attends a debate on the ECB Annual Report for 2014, at the European Parliament in Strasbourg, France, February 1, 2016. REUTERS/Vincent Kessler 

European Central Bank President Mario Draghi adjusts his earphones as he attends a debate on the ECB Annual Report for 2014, at the European Parliament in Strasbourg, France, February 1, 2016. REUTERS/Vincent Kessler 

Greek Prime Minister Alexis Tsipras attends the session 'The Future of Europe' at the annual meeting of the World Economic Forum (WEF) in Davos, Switzerland January 21, 2016. REUTERS/Ruben Sprich 

Christine Lagarde, Managing Director, International Monetary Fund (IMF), attends the session 'Where Is the Chinese Economy Heading?' of the annual meeting of the World Economic Forum (WEF) in Davos, Switzerland January 21, 2016. REUTERS/Ruben Sprich