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

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

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

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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)

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)

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)

BT (British Telecom) telephone boxes are seen on the seafront, in Brighton, southern England May 11, 2009. Britain's BT Group 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. Photograph taken on May 11, 2009. REUTERS/Luke MacGregor (BRITAIN BUSINESS)

A pedestrian speaks on a mobile phone near the British Telecom Tower in central London May 11, 2009. Britain's BT Group 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. Photograph taken on May 11, 2009. REUTERS/Stefan Wermuth (BRITAIN BUSINESS)

A pedestrian speaks on a mobile phone near the British Telecom Tower in central London May 11, 2009. Britain's BT Group 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. Photograph taken on May 11, 2009. REUTERS/Stefan Wermuth (BRITAIN BUSINESS)

A telephone box is seen near the the British Telecom Tower in central London May 11, 2009. Britain's BT Group 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. Photograph taken on May 11, 2009. REUTERS/Stefan Wermuth (BRITAIN BUSINESS)

The British Telecom Tower is seen in central London May 11, 2009. Britain's BT Group 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. Photograph taken on May 11, 2009. REUTERS/Stefan Wermuth (BRITAIN BUSINESS)

The British Telecom Tower is seen in central London May 11, 2009. Britain's BT Group 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. Photograph taken on May 11, 2009. REUTERS/Stefan Wermuth (BRITAIN BUSINESS)

The British Telecom tower is seen in Birmingham, central England February 10, 2009. Britain's BT Group on Thursday announced it saw core earnings slump 9 percent in the third quarter and pre-tax profits crash 81 percent due to problems at its global network services unit, while its pension swung to a big deficit. BT said it would work to improve profitability at Global Services, save costs and limit capital expenditure to hit a new target of generating free cash flow of over 1 billion pounds ($1.44 billion) next year. Picture taken February 10, 2009. REUTERS/Darren Staples (BRITAIN)

The British Telecom tower is seen in Birmingham, central England February 10, 2009. Britain's BT Group on Thursday announced it saw core earnings slump 9 percent in the third quarter and pre-tax profits crash 81 percent due to problems at its global network services unit, while its pension swung to a big deficit. BT said it would work to improve profitability at Global Services, save costs and limit capital expenditure to hit a new target of generating free cash flow of over 1 billion pounds ($1.44 billion) next year. REUTERS/Darren Staples (BRITAIN)

The British Telecom tower is seen reflected in rain drops on a telephone booth in Birmingham, central England February 10, 2009. Britain's BT Group on Thursday announced it saw core earnings slump 9 percent in the third quarter and pre-tax profits crash 81 percent due to problems at its global network services unit, while its pension swung to a big deficit. BT said it would work to improve profitability at Global Services, save costs and limit capital expenditure to hit a new target of generating free cash flow of over 1 billion pounds ($1.44 billion) next year. Picture taken February 10, 2009. REUTERS/Darren Staples (BRITAIN)

A telephone box is seen near the British Telecom tower in Birmingham, central England February 10, 2009. Britain's BT Group on Thursday announced it saw core earnings slump 9 percent in the third quarter and pre-tax profits crash 81 percent due to problems at its global network services unit, while its pension swung to a big deficit. BT said it would work to improve profitability at Global Services, save costs and limit capital expenditure to hit a new target of generating free cash flow of over 1 billion pounds ($1.44 billion) next year. Picture taken February 10, 2009. REUTERS/Darren Staples (BRITAIN)

A woman walks in the shadows of the British Telecom tower in Birmingham, central England February 10, 2009. Britain's BT Group on Thursday announced it saw core earnings slump 9 percent in the third quarter and pre-tax profits crash 81 percent due to problems at its global network services unit, while its pension swung to a big deficit. BT said it would work to improve profitability at Global Services, save costs and limit capital expenditure to hit a new target of generating free cash flow of over 1 billion pounds ($1.44 billion) next year. Picture taken February 10, 2009. REUTERS/Darren Staples (BRITAIN)

The British Telecom logo is seen, in central London November 13, 2008. Britain's BT Group beat
second-quarter earnings forecasts on Thursday and announced 10,000 job cuts and a possible boost to its pension scheme, sending its shares up over 12 percent just days after a profit warning. REUTERS/Toby Melville (BRITAIN)

The British Telecom tower is seen, in central London November 13, 2008. Britain's BT Group beat
second-quarter earnings forecasts on Thursday and announced 10,000 job cuts and a possible boost to its pension scheme, sending its shares up over 12 percent just days after a profit warning. REUTERS/Toby Melville (BRITAIN)