How do I default country code on phone field?

In Youform phone block question, the country code is auto selected by default according to the user's browser location. So when you when you create the form or testing it, and say you are based in United States, the default country for you will be shown as US, but let's say your form responder is based in Brazil, then for them the default country selected will be Brazil. 
Obviously users can change the country code of their phone number. 
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