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Optimizations:
Reduced whitespace for better readability.
Imported only necessary methods from the phonenumbers library. Removed unnecessary semicolon.
Renamed region_code_for_country_code and region_code_for_number to region_code_for_country and region_code_for_number, respectively, for consistency. Used tuple unpacking to assign values to lat and lng. Removed Missing or invalid number message, as it was not informative enough, and replaced it with a more informative message.