TurboTax does not allow the entry of a foreign phone number. Some forms require a phone number and only a US number can be used. IRS specifications must be met as well.
You can use a number such as 111-111-1111 which will be recognized by the IRS as a place-holder. Or you can use a phone number of a US relative. The IRS doesn't ordinarily initiate any calls to taxpayers.
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