The survey has revealed that 68 percent of Britons would happily take a mobile phone call during a dinner date even if they know it is not important.
The study reveals the rise of ‘Rude Britannia’ since the proliferation of smartphones, with 63 percent leaving their devices on the table while out for dinner with a friend.
More than a third of those questioned admitted they would struggle to live without their mobiles.
More than half – 59 percent keep their phones with them at all times, and 16 percent walk around with them in their hands all the time.
One in seven of the 1,000 people polled even take their phones to the toilet with them to send text messages or check Facebook.
“The British have always been synonymous with good manners and politeness,” a major newspaper quoted a mobile phone company's owner, which conducted the study, as saying.
“The research shows we are shunning our manners due to obsessive phone addiction.
“It was only 10 to 15 years ago when high earners and business people were the only owners of clunky mobile phones. Now everyone from young children to pensioners relies heavily on a mobile phone.
“If we are not accepting calls and texts at dinner, we are playing games, watching videos or organising our lives with them” she said.
The research suggests people Britain cannot bear to be separated from their smartphones, with more than a third admitting they would struggle to live without their mobiles.
Around a third - 35 percent - said they couldn’t live without their television, 23 per cent without their laptop, three per cent would be at a loss if they did not have their iPod, and two per cent would struggle without their tablet.
Photos: 'Rock On 2' stars Farhan, Shraddha on 'Yaaron Ki Baraat'
Photos: Ajay Devgn launches 'Shivaay' comics at Mumbai Comic Con
Photos: WWE star Sheamus and John Abraham clash in Mumbai
Umesh Yadav's birthday: Indian cricketers and their tales of struggle
Photos: Raveena Tandon, husband Anil Thadani's dinner date in Bandra