The team from Saatchi & Saatchi, the agency behind the campaign, will now be in a race against time to edit 'Sing-along' in time for screening during ITV1's 'Britain's Got Talent' tomorrow night in a two-minute long spot. Media is through Mediacom.
The event was hosted by Vernon Kaye and featured members of the public joining in, singing along to hits such as 'Is This The Way To Amarillo' and 'Hey Jude'. They were filmed by 24 cameras and recorded by more than 2,000 microphones.
Footage of the event has been posted by attendees on You Tube. The official version of the dance flash mob has received more than 11m views on YouTube.
T-Mobile is pushing this new campaign with similar social networking tactics on Facebook and YouTube.
Lysa Hardy, head of brand and communications at T-Mobile, said: "'Dance' was always going to be a hard act to follow, but we think we've created a worthy sequel with 'Sing-along'.
"It's another great dramatisation of our 'Life's for Sharing' strapline -- something that's unexpected, wonderful and exciting that you want to share with your friends and family."