Write a function that, given a list of phone numbers, transforms them so they all start with a specified phone country code, preceded by the + sign. Any whitespaces from a phone number should also be removed. The following is a list of input and output examples:
07555 123456 => +44755512345607555123456 => +447555123456+44 7555 123456 => +44755512345644 7555 123456 => +4475551234567555 123456 => +447555123456
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