If you’ve got a O2 Genion mobile phone, you can save a considerable amount of money for national calls from your mobile to national and international mainlines. You just need a Linux box and an ISDN line with a service provider of your choice. You can save even more money with special billing options from Hansenet, Telekom or Arcor. Try it out and see for yourself: c’t 13/2005, S. 216.
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