A mobile phone network in Germany operated by Deutsche Telekom AG's T-Mobile unit collapsed on Tuesday after a glitch in the software system.
Deutsche Telekom said the main disruption of T-Mobile's voice and text message services happened between 1400 - 1700 GMT and it would be back up over the course of the evening.
The network has about 40 million users.
The problem struck on the same day Deutsche Telekom slashed its earnings forecasts for 2009 and saw its share price tumble 7.2%.
