old_contents: from __future__ import unicode_literals
  from .. import Provider as PhoneNumberProvider
  
  
  class Provider(PhoneNumberProvider):
      formats = (
          '+44(0)##########',
          '+44(0)#### ######',
          '+44(0)#########',
          '+44(0)#### #####',
          '0##########',
          '0#########',
          '0#### ######',
          '0#### #####',
          '(0####) ######',
          '(0####) #####',
      )
  
new_contents: from __future__ import unicode_literals
  from .. import Provider as PhoneNumberProvider
  
  
  class Provider(PhoneNumberProvider):
      # Source: https://en.wikipedia.org/wiki/Telephone_numbers_in_the_United_Kingdom
  
      cellphone_formats = (
          '+44 7### ######',
          '+44 7#########',
          '07### ######',
          '07#########',
      )
  
      formats = (
          '+44(0)##########',
          '+44(0)#### ######',
          '+44(0)#########',
          '+44(0)#### #####',
          '0##########',
          '0#########',
          '0#### ######',
          '0#### #####',
          '(0####) ######',
          '(0####) #####',
      )
  
      def cellphone_number(self):
          pattern = self.random_element(self.cellphone_formats)
          return self.numerify(self.generator.parse(pattern))
  
subject: Add en_GB cellphone formats