How can I complete my personal information if the only phone number I have is a swiss one?

[DoninGA]

Just enter a US area code and then a phony number.  A phone number is not required to file a tax return although TurboTax requires one to complete a return.

Use (202) 222-2222

[CatinaT1]

You can use 800-555-1212 (Standard directory assistance) or 111-111-1111.