T-Mobile USA Sees High-Speed Network 2 Years Off  NEW YORK (Reuters) - T-Mobile USA, the U.S. wireless unit  of Deutsche Telekom AG &lt;A HREF="http://www.reuters.co.uk/financeQuoteLookup.jhtml?ticker=DTEGn.DE qtype=sym infotype=info qcat=news"&gt;DTEGn.DE&lt;/A&gt;, does not expect to offer  broadband mobile data services for at least the next two years,  its chief executive said on Thursday.