+44-20-(33980000...33989999): London, City of London (LND) Read more about +44-20-(33980000...33989999)
+44-8440-(000000...000999): Non ‘BT Discount Scheme’ - Internet Services incorporating un-metered access up to and including 5p for BT customers Read more about +44-8440-(000000...000999)
+44-8444-(730000...739999): Special Services basic rate: up to and including 5p for BT customers (non-internet) Read more about +44-8444-(730000...739999)
+44-8447-(620000...629999): Special Services basic rate: up to and including 5p for BT customers (non-internet) Read more about +44-8447-(620000...629999)
+44-8455-(450000...459999): Special Services basic rate: BT’s Standard Local Call Retail Price for BT customers Read more about +44-8455-(450000...459999)