+44-121-(5990000...5999999): Birmingham, Birmingham (BIR) Read more about +44-121-(5990000...5999999)
+44-161-(8080000...8089999): Manchester, Manchester (MAN) Read more about +44-161-(8080000...8089999)
+44-20-(81610000...81619999): London, City of London (LND) Read more about +44-20-(81610000...81619999)
