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(This means you will need a GSM cellphone that will work on 900MHz or 1800Mhz to use it in Switzerland.)
Frequency: GSM 1800
Website: www.orange.ch
Frequency: GSM 900/1800
Website: www.sunrise.ch
Frequency: GSM 900/1800
Website: www.swisscom.com
If you've used either of these networks or roamed in Switzerland, please post about your experience and the cost. Feel free to ask questions.