You cannot enter a foreign phone number in TurboTax. You can leave the field blank or you can enter the phone number of a relative or friend in the U.S,, or a "dummy number" (800-555-1212). This will allow you to complete your return, and the IRS will identify your entry as a placeholder number - if they have questions, they will mail them to you." The IRS does not call taxpayers anyway.
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