T-Mobile's root company Deutsche Telekom is more seriously considering buying Sprint in what could be a major shakeup of the US cellphone industry, according to sources. The two have been rumored in talks for such a deal for over a year, but tips to the Telegraph now have the German firm bringing in financial advisers from Deutsche Bank to evaluate the possibility of making a bid for the ailing but still larger American provider. An offer could be made as soon as within a few weeks, the insiders said, though the likely terms of the deal haven't been mentioned.