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Accountancy giant PwC is removing landlines at workplace desks, with all workers anticipated to solely use mobiles by the tip of the summer time.
The firm, which has 24 places of work in the UK using about 18,000 workers, mentioned the change to mobiles could be "more efficient".
A couple of landlines will stay for safety to make use of, and in rooms used for client conferences and at reception.
Meeting rooms will use new conferencing expertise that may connect with mobiles.
"We already equip all of our people with a mobile phone, and many had already moved away from using their landlines," a spokesman for PwC mentioned.
"With landline usage falling rapidly, we believe that a more mobile-focused policy is a more efficient way of working."
Some small companies have deserted fixed-line telephones in favour of mobiles in latest years, however PwC's move is likely one of the first examples of a massive organization doing so.
It comes amid a steep decline in landline use by enterprise.
In 2010, companies in the UK had greater than 10 million landline numbers. However, that quantity had fallen 35% to only 6.4 million by the tip of final 12 months, in line with Ofcom.
The period of time companies spent speaking on landlines has dropped much more dramatically.
Calls dwindle
In 2010, companies logged nearly 38 million minutes of calls, however that has halved to 18.eight million in 2017.
Residential use of landlines can also be in decline. In 2010 UK households made greater than 90 million minutes of cellphone calls, however that had fallen to nearly 35 million minutes by final 12 months.
However, most properties want a landline for broadband, so the variety of residential strains has really elevated since 2010.
"Because of the pricing structure most people have to have a landline to get broadbandbut younger people often don't even plug in a handset," factors out James Barford, a telecoms analyst at Enders Analysis.
Price investigation
Earlier this 12 months, BT was pressured to chop the price of a landline by £7 a month for purchasers that solely had a landline.
The value lower happened following a regulatory investigation by telecoms watchdog Ofcom.
It discovered that though landline rental costs had elevated considerably, the price of offering the providers had dropped by greater than a quarter.
Ofcom mentioned the toughest hit by the rises have been clients, a lot of them aged, who had by no means switched from BT.