How to set a formatted string in PhoneField component without selecting the select box?

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Hi, everyone.

I'm trying to figure out a way to force the user to select the country from the country select box or automatically set a formatted string(`+[countryCode][local phone number]`) based on the country code of the buyerIdentity in the cart object without selecting the country select box. 
Is it possible to apply either way?

Or can I catch or detect the country select box is selected?

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