1. Dial the international exit code for Switzerland, which is 011.
2. Dial the country code for the United States, which is 1.
3. Dial the area code of the city you are calling in the United States (for example, 212 for New York City).
4. Dial the local phone number of the person or business you are calling.
Here is an example of how to call a landline number in New York City from Zurich, Switzerland:
011 + 1 + 212 + 12345678
If you are calling a mobile phone in the United States, you will need to dial the mobile phone number after the country code and area code. For example, to call a mobile phone with the number 0123456789 in New York City from Zurich, Switzerland, you would dial:
011 + 1 + 212 + 0123456789
You may also need to dial a trunk code or carrier code before the country code. The trunk code for Switzerland is 00, and the carrier code for some carriers may vary. You can check with your phone carrier for the correct trunk and carrier codes to use when making international calls.