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Deutsche Telecom shares showed a gain of 4.21 percent, leaping to the top of gainers on the DAX index which was 0.70 percent lower overall.
According to market rumours, the group's troubled T-Mobile USA unit is to merge with rival Sprint.
Deutsche Telecom finance director Tim Hoettges told AFP in an e-mail that "all options are open" for the US unit, whether it was "a full or partial sale, or a partnership."