Mobile phone giant Vodafone is mulling a bid for T-Mobile UK, the British wireless unit of Deutsche Telekom, according to press reports.The Financial Times is quoting people familiar with the situation as saying that the company is considering making an offer for T-Mobile UK, which has an estimated enterprise value of €3bn-€4bn, or setting up a joint venture.However, a potential deal could be in danger of being blocked by regulators, according to the paper.Deutsche Telekom is said to have appointed JPMorgan to advise on the strategic options for the business.