Deutsche Telekom is working on a long-term plan for its U.S. wireless unit after a deal with AT&T collapsed, Chief Executive Rene Obermann said on Tuesday.

In the long term, we need more spectrum and network capacity. We are working on that, Obermann told journalists during a conference call, but he declined to say what Deutsche Telekom's Plan B for the unit was.

AT&T said on Monday it had dropped its $39 billion bid for T-Mobile USA, bowing to fierce regulatory opposition and leaving both companies scrambling for alternatives.

(Reporting by Maria Sheahan)

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