The mobile network said the new campaign, created by Saatchi & Saatchi London, is the first to guarantee that its customers will always have an unbeatable minutes allowance.
It reaffirms the company's positioning as the best value for money mobile network, by challenging consumers to find more minutes for £30.
T-Mobile is the latest mobile network to unveil a new strapline as customers become increasingly price-focused in their decision-making when purchasing mobile phone tariffs.
O2 recently unveiled "We're' better, connected", while French-owned network Orange is set to announce a new positioning in Paris this weekend through Fallon London.
Last year, 3 ditched advertising agency WCRS and hired Euro RSCG to replace its brand campaign with price-focused advertising.
T-Mobile said its new campaign is based on the proposition that it will match or beat the amount of minutes offered on a like-for-like basis by the other four operators.
The TV ad shows people from different walks of life searching for minutes in unusual places.
The first spot, which breaks during tomorrow's Euro 2008 semi-final on ITV1 8.30pm, features an archaeologist discarding priceless Roman artefacts as he hunts for more minutes.
A second ad shows a medium at a seance searching in the afterlife and reaching one attendee's dead uncle.
Karen Phipson, head of brand and communications at T-Mobile, said: "'Life's for sharing' really cements our focus on relationships, in a way that's energetic, dynamic and involving.
"It's apt that we launch the new strapline in conjunction with our minutes promise, which is all about supporting our customers lives through every-day unbeatable value."
The TV spots will be supported by national press, online and outdoor ads including station domination at Oxford Circus Tube station from June 30. Media was planned and bought by MediaCom.
Outdoor activity includes the IMAX cinema at London's Waterloo, which claims to be the largest single advertising location in the capital.
Paul Silburn, a creative partner at Saatchi & Saatchi London, added: "Everyone loves a bargain and people will often search high and low to find the best deal. The creative brings that to life."
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