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Do you need to use the dropdown list for area code part?

It will require a customization

or follow the instructions below to set default country code value

Hello,

What exactly do you need to achieve?

By default, there is no such feature
it can be implemented as a customization

but you can set a default value for 'code' section that will be always displayed on profile form:
for that you...

You should go to Categories > Categories > your primary category or parent category > Build > Build Browse Form > add fields you need
and then use them: {$listing.fields.your_field_key.value}
...

Hello,

You can get your value using this path: {$listing.fields.phone_number.value}