BT Group is set to become a takeover target for Deutsche Telekom, according to media reports.Speculation of a tie-up comes as Deutsche Telekom is reportedly in advanced talks to merge its American arm, T-Mobile US, with satellite pay-TV operator Dish Networks. If a deal is struck, the likelihood of a takeover of BT will increase, the Telegraph reported on Sunday.Merging T-Mobile US with Dish is seen as a way for Deutsche Telekom to exit the American market, in which it has struggled, although it is now enjoying improving market share. It could then redeploy billions in Europe by buying BT, in a deal that would realise the long-held ambitions of industry executives to join up their networks across borders.