Map of the dialing codes of the telephone network of Switzerland
<a href="https://de.wikipedia.org/wiki/User:Chumwa" class="extiw" title="de:User:Chumwa">Maximilian Dörrbecker</a> (<a href="https://de.wikipedia.org/wiki/User:Chumwa" class="extiw" title="de:User:Chumwa">Chumwa</a>)
CC BY-SA 2.5
Own work  using: <a href="//commons.wikimedia.org/wiki/File:Switzerland_location_map.svg" title="File:Switzerland location map.svg">Switzerland_location_map.svg</a>