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+44-121-(6140000...6149999): Birmingham, Birmingham (BIR) Read more about +44-121-(6140000...6149999)
+44-161-(8130000...8139999): Manchester, Manchester (MAN) Read more about +44-161-(8130000...8139999)
+44-20-(35110000...35119999): London, City of London (LND) Read more about +44-20-(35110000...35119999)
