For the phone number, if it's not a U.S. phone number, you can just leave the phone number blank.
Also, be aware that if you plan to pay your TurboTax fees with a credit or debit card, that card MUST:
- Be in U.S. Funds (dollars)
- Have a valid U.S. Billing Address
- Have a valid U.S. phone number tied to it
Otherwise, the credit/debit card will be rejected for payment.
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Turbotax Online is not officially supported for overseas taxpayers. (I don't know why.)
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