British Telecom (BT) advertisement is displayed at Goodge Street underground station in London, Britain, November 15, 2019. REUTERS/Simon Dawson 

People walk past British Telecom (BT) headquarters in London, Britain, November 15, 2019. REUTERS/Simon Dawson 

BT Tower owned by British Telecom is pictured in London, Britain, November 15, 2019. REUTERS/Simon Dawson 

BT Tower owned by British Telecom is pictured in London, Britain, November 15, 2019. REUTERS/Simon Dawson 

BT Tower owned by British Telecom is pictured in London, Britain, November 15, 2019. REUTERS/Simon Dawson 

Logo of British Telecom (BT) is displayed outside a store in London, Britain, November 15, 2019. REUTERS/Simon Dawson 

A man walks past British Telecom (BT) headquarters in London, Britain, November 15, 2019. REUTERS/Simon Dawson 

People enter British Telecom (BT) headquarters in London, Britain, November 15, 2019. REUTERS/Simon Dawson 

Company's logo is displayed at British Telecom (BT) headquarters in London, Britain, November 15, 2019. REUTERS/Simon Dawson 

People walk past British Telecom (BT) headquarters in London, Britain, November 15, 2019. REUTERS/Simon Dawson 

People walk past British Telecom (BT) headquarters in London, Britain, November 15, 2019. REUTERS/Simon Dawson 

British Telecom (BT)'s headquarters is seen in central London, Britain May 10, 2018. REUTERS/Hannah McKay 

British Telecom (BT)'s headquarters is seen in central London, Britain May 10, 2018. REUTERS/Hannah McKay 

British Telecom (BT)'s headquarters is seen in central London, Britain May 10, 2018. REUTERS/Hannah McKay 

British Telecom (BT)'s headquarters is seen in central London, Britain May 10, 2018. REUTERS/Hannah McKay 

British Telecom (BT)'s headquarters is seen in central London, Britain May 10, 2018. REUTERS/Hannah McKay 

British Telecom (BT)'s headquarters is seen in central London, Britain May 10, 2018. REUTERS/Hannah McKay 

British Telecom (BT)'s headquarters is seen in central London, Britain May 10, 2018. REUTERS/Hannah McKay 

Gavin Patterson, CEO of BT, speaks at the Conferederation of British Industry's annual conference in London, Britain, November 6, 2017. REUTERS/Mary Turner 

Gavin Patterson, CEO of BT, speaks at the Conferederation of British Industry's annual conference in London, Britain, November 6, 2017. REUTERS/Mary Turner 

Gavin Patterson, CEO of BT, speaks at the Conferederation of British Industry's annual conference in London, Britain, November 6, 2017. REUTERS/Mary Turner 

Gavin Patterson, CEO of BT, speaks at the Conferederation of British Industry's annual conference in London, Britain, November 6, 2017. REUTERS/Mary Turner 

A BT telephone engineer carries out work outside a traditional British Telecom red telephone box in Parkgate, Britain, August 22, 2017. REUTERS/Phil Noble 

The logo for the British Telecom group is seen outside of offices in the City of London, Britain, January 16 , 2017. REUTERS/Toby Melville 

The logo for the British Telecom group is seen outside of offices in the City of London, Britain, January 16 , 2017. REUTERS/Toby Melville 

A BT (British Telecom) company logo is pictured on the side of a convention centre in Liverpool northern England, April 9, 2016. REUTERS/Phil Noble 

A BT engineer repairs a phone line during snowfall in Buxton, Britain March 4, 2016. REUTERS/Darren Staples 

BT Corporate UK and Ireland Managing Director Colm O'Neill, speaks at the British chambers of Commerce annual conference in London Britain, March 3, 2016. REUTERS/Peter Nicholls 

BT Corporate UK and Ireland Managing Director Colm O'Neill, speaks at the British chambers of Commerce annual conference in London Britain, March 3, 2016. REUTERS/Peter Nicholls 

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People get in and out of traditional telephone boxes in London January 15, 2015. British regulator Ofcom has said it would set up a safeguard to make sure BT maintains a sufficient margin between its wholesale and retail superfast broadband charges to allow rival providers to profitably match its prices.
REUTERS/Luke MacGregor (BRITAIN - Tags: BUSINESS TELECOMS SOCIETY) 

A man passes a row of traditional telephone boxes in London January 15, 2015. British regulator Ofcom has said it would set up a safeguard to make sure BT maintains a sufficient margin between its wholesale and retail superfast broadband charges to allow rival providers to profitably match its prices.
REUTERS/Luke MacGregor (BRITAIN - Tags: SOCIETY BUSINESS TELECOMS TRAVEL) 

VIVA Chief Executive Officer Ulaiyan Al Wataid (L) shakes hands with British Telecom Vice President MENA and Eastern Mediterranean Division, Wael El Kabbany (R) as Bahrain's Minister of State for Telecommunication Sheikh Fawaz bin Mohammed looks on during a news conference to announce the BT's partnership with the VIVA, a subsidiary of Saudi Telecom Company Group, to build a global IP Exchange Interoperability Hub in Manama April 22, 2014. REUTERS/Hamad I Mohammed (BAHRAIN - Tags: BUSINESS TELECOMS) 

British Telecom Vice President for MENA and Eastern Mediterranean Division, Wael El Kabbany speaks during a news conference to announce the BT's partnership with the VIVA, a subsidiary of Saudi Telecom Company Group, to build a global IP Exchange Interoperability Hub in Manama, April 22, 2014. REUTERS/Hamad I Mohammed (BAHRAIN - Tags: BUSINESS TELECOMS) 

The British Telecom tower displays "it's a boy" to mark the birth of a baby boy for Catherine, Duchess of Cambridge and her husband Prince William, in London July 23, 2013. Already touted as one of the most famous babies in the world, the first child of Prince William and wife Kate faces a life in the spotlight like no previous royal, severely testing the couple's desire to give their offspring a "normal" life. REUTERS/Paul Hackett (BRITAIN - Tags: ROYALS SOCIETY BUSINESS TELECOMS ENTERTAINMENT) 

The British Telecom tower displays "it's a boy" to mark the birth of a baby boy for Catherine, Duchess of Cambridge and her husband Prince William, in London July 23, 2013. Already touted as one of the most famous babies in the world, the first child of Prince William and wife Kate faces a life in the spotlight like no previous royal, severely testing the couple's desire to give their offspring a "normal" life. REUTERS/Paul Hackett (BRITAIN - Tags: ROYALS SOCIETY BUSINESS TELECOMS ENTERTAINMENT) 

The BT communication tower (R) is seen from Primrose Hill in London April 9, 2013. The sale of BT in 1984 began what was dubbed "the long march of privatisation" under 18 years of Conservative rule which has been emulated by governments around the world. The Conservative legacy, begun under Margaret Thatcher, transformed British industry and even helped inspire the former communists of eastern Europe. Thatcher died on Monday in London after suffering a stroke at the age of 87. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS POLITICS TELECOMS) 

The BT communication tower is seen from Primrose Hill in London April 9, 2013. The sale of BT in 1984 began what was dubbed "the long march of privatisation" under 18 years of Conservative rule which has been emulated by governments around the world. The Conservative legacy, begun under Margaret Thatcher, transformed British industry and even helped inspire the former communists of eastern Europe. Thatcher died on Monday in London after suffering a stroke at the age of 87. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS POLITICS TELECOMS) 

The BT communication tower is seen from Primrose Hill in London April 9, 2013. The sale of BT in 1984 began what was dubbed "the long march of privatisation" under 18 years of Conservative rule which has been emulated by governments around the world. The Conservative legacy, begun under Margaret Thatcher, transformed British industry and even helped inspire the former communists of eastern Europe. Thatcher died on Monday in London after suffering a stroke at the age of 87. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS POLITICS TELECOMS) 

The BT communication tower is seen from Primrose Hill in London April 9, 2013. The sale of BT in 1984 began what was dubbed "the long march of privatisation" under 18 years of Conservative rule which has been emulated by governments around the world. The Conservative legacy, begun under Margaret Thatcher, transformed British industry and even helped inspire the former communists of eastern Europe. Thatcher died on Monday in London after suffering a stroke at the age of 87. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS POLITICS TELECOMS) 

The BT communication tower is seen from Primrose Hill in London April 9, 2013. The sale of BT in 1984 began what was dubbed "the long march of privatisation" under 18 years of Conservative rule which has been emulated by governments around the world. The Conservative legacy, begun under Margaret Thatcher, transformed British industry and even helped inspire the former communists of eastern Europe. Thatcher died on Monday in London after suffering a stroke at the age of 87. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS POLITICS TELECOMS) 

An old BT telephone box painted with the Union flag stands out in the snow at Staplefield in south east England January 19, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: ENVIRONMENT BUSINESS TELECOMS) 

A man makes a telephone call, in central London May 12, 2011. BT, Britain's biggest fixed-line telecoms supplier, has set itself tougher than expected targets for the next two years after posting strong full-year results and resolving a lingering concern with its pension scheme.
REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS) 

The BT communication tower is seen in the background as a man walks up Primrose Hill in London February 3, 2011. British telecoms provider BT reported a 7 percent increase in third-quarter core profit as it continued to cut costs, and said its recovering Global Services unit would generate free cash flow this year. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS CITYSCAPE) 

The BT communication tower is seen in the background as people walk on Primrose Hill in London February 3, 2011. British telecoms provider BT reported a 7 percent increase in third-quarter core profit as it continued to cut costs, and said its recovering Global Services unit would generate free cash flow this year. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS CITYSCAPE) 

The BT communication tower is seen in the background as a man walks down Primrose Hill in London February 3, 2011. British telecoms provider BT reported a 7 percent increase in third-quarter core profit as it continued to cut costs, and said its recovering Global Services unit would generate free cash flow this year. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS CITYSCAPE) 

The BT communication tower is seen in the background as people walk on Primrose Hill in London February 3, 2011. British telecoms provider BT reported a 7 percent increase in third-quarter core profit as it continued to cut costs, and said its recovering Global Services unit would generate free cash flow this year. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS CITYSCAPE) 

A British Telecom engineer repairs cables to the telephone and internet network in central London January 23, 2011. REUTERS/Luke MacGregor (BRITAIN - Tags: BUSINESS SCI TECH EMPLOYMENT) 

Telephone boxes are reflected in raindrops in central London November 11, 2010. British telecoms provider BT Group Plc raised its full-year core earnings outlook on Thursday, after strong broadband and Global Services demand boosted second-quarter results and lifted its shares 5.5 percent. REUTERS/Toby Melville (BRITAIN - Tags: BUSINESS) 

Telephone boxes are seen in central London November 11, 2010. British telecoms provider BT Group Plc raised its full-year core earnings outlook on Thursday, after strong broadband and Global Services demand boosted second-quarter results and lifted its shares 5.5 percent. REUTERS/Toby Melville (BRITAIN - Tags: BUSINESS) 

Telephone boxes are seen in central London November 11, 2010. British telecoms provider BT Group Plc raised its full-year core earnings outlook on Thursday, after strong broadband and Global Services demand boosted second-quarter results and lifted its shares 5.5 percent. REUTERS/Toby Melville (BRITAIN - Tags: BUSINESS) 

A woman speaks on her mobile phone outside a row of telephone boxes in central London November 11, 2010. British telecoms provider BT Group Plc raised its full-year core earnings outlook on Thursday, after strong broadband and Global Services demand boosted second-quarter results and lifted its shares 5.5 percent. REUTERS/Toby Melville (BRITAIN - Tags: BUSINESS) 

Telephone boxes are seen in central London November 11, 2010. British telecoms provider BT Group Plc raised its full-year core earnings outlook on Thursday, after strong broadband and Global Services demand boosted second-quarter results and lifted its shares 5.5 percent. REUTERS/Toby Melville (BRITAIN - Tags: BUSINESS) 

A pedestrian walks past British Telecom telephone boxes in London May 13, 2010. British telecoms provider BT Group Plc showed evidence of a long-awaited turnaround as cost cuts and service improvements began to bite, slowing its full-year revenue decline to 2 percent and lifting its shares 11 percent. REUTERS/Paul Hackett (BRITAIN - Tags: BUSINESS) 

British Telecom telephone boxes are seen in central London May 13, 2010. British telecoms provider BT Group Plc showed evidence of a long-awaited turnaround as cost cuts and service improvements began to bite, slowing its full-year revenue decline to 2 percent and lifting its shares 11 percent. REUTERS/Paul Hackett (BRITAIN - Tags: BUSINESS) 

Stephen Dorrell, Financial Secretary to the Treasury, officially closes the door on the BT3 share offer at a NatWest branch in the City of London, July 14, 1993. The government received more than one million applications for shares in the flotation of its remaining 22 percent stake in British Telecom. REUTERS/Simon Kreitem (BRITAIN - Tags: BUSINESS POLITICS) 

Fireworks explode over the illuminated BT Tower in London October 31, 2009. The event was part of a three day celebration to mark the 1000 day countdown to the London 2012 Olympic games. REUTERS/Jas Lehal (BRITAIN SPORT OLYMPICS IMAGES OF THE DAY) 

Phone boxes are seen in the garden of Mike and Margaret Shores, who renovate old phone boxes, in Carlton Miniott, northern England May 12, 2009. Mike and his wife Margaret took over the business in 1966 and started renovating phone boxes 17 years ago; they now have around 40 boxes which are renovated to order.. REUTERS/Nigel Roddis (BRITAIN BUSINESS) 

A ram's skull hangs in a British Telecom phone box near Ballycastle in the Glens Of Antrim, Northern Ireland, May 14,2009. British telecoms carrier BT cut its dividend on May 14, 2009, and said a further 15,000 jobs would go after a 1.58 billion pound ($2.4 billion) write down and restructuring at its Global Services unit drove it to a fourth quarter loss. REUTERS/Cathal McNaughton (NORTHERN IRELAND BUSINESS SCI TECH)