+44-117-(2700000...2709999): Bristol, City of Bristol (BST) Read more about +44-117-(2700000...2709999)
+44-121-(5490000...5499999): Birmingham, Birmingham (BIR) Read more about +44-121-(5490000...5499999)
+44-161-(3110000...3119999): Manchester, Manchester (MAN) Read more about +44-161-(3110000...3119999)
+44-20-(35630000...35639999): London, City of London (LND) Read more about +44-20-(35630000...35639999)