More than 40,000 BT workers will go on strike on 29 July and 1 August, the Communication Workers Union (CWU) has said.
The union said the industrial action may cause “significant issues” for those working from home and is likely to have a “serious effect” on the roll-out of ultra-fast broadband.
BT staff voted last month to go on strike for the first time in 35 years, with union bosses arguing that a £1,500 pay rise proposed by the company was inadequate to help staff deal with the cost of living crisis.
The former state-owned monopoly is responsible for answering all 999 calls and is drawing up contingency plans to manage any disruption, Sky News understands.
CWU general secretary Dave Ward said: “For the first time since 1987, strike action will now commence at BT Group.
“This is not a case of an employer refusing to meet a union’s demands – this is about an employer refusing to meet us whatsoever.
“The serious disruption this strike may cause is entirely down to [chief executive] Philip Jansen and his friends, who have chosen to stick two fingers up to their own workforce.”
He said BT staff had received a real-terms pay cut as a reward for working “under great difficulty” during the pandemic.
“These are the same workers who kept the country connected during the pandemic,” he said.
“Without CWU members in BT Group, there would have been no home-working revolution, and vital technical infrastructure may have malfunctioned or been broken when our country most needed it.”
He said Mr Jansen had “gifted himself” a £3.5m pay package amounting to a 32% pay increase, while BT’s chief financial officer received £2.2m – a 25% increase.
He said £700m has also been paid out to shareholders.
“The reason for the strike is simple: workers will not accept a massive deterioration in their living standards,” Mr Ward said.
“We won’t have bosses using Swiss banks while workers are using food banks.
“BT Group workers are saying: enough is enough. We are not going to stop until we win.”
Deputy general secretary Andy Kerr said management had refused to meet the union to negotiate a pay deal.
BT is among a string of companies, including British Airways and Royal Mail, that are facing the most significant industrial unrest for years as millions of Britons struggle to cope with soaring inflation.
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