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Phone number 010 300 3063 with countrycode 31
originate from Rotterdam in Netherlands and it is a fixed line telephone number.
Netherlands's isocodes are NL and NLD.
When calling from abroad use either two zeros (00) or a plus sign (+) and then the country code before typing the number. Example: +31 103003063 or 0031 103003063.
This number is a valid existing number.