+44-117-(4150000...4159999): Bristol, City of Bristol (BST) Read more about +44-117-(4150000...4159999)
+44-121-(3910000...3919999): Birmingham, Birmingham (BIR) Read more about +44-121-(3910000...3919999)
+44-161-(4690000...4699999): Manchester, Manchester (MAN) Read more about +44-161-(4690000...4699999)
+44-20-(37030000...37039999): London, City of London (LND) Read more about +44-20-(37030000...37039999)