+44-8443-(860000...869999): Special Services basic rate: up to and including 5p for BT customers (non-internet) Read more about +44-8443-(860000...869999)
+44-8454-(770000...779999): Special Services basic rate: BT’s Standard Local Call Retail Price for BT customers Read more about +44-8454-(770000...779999)
+44-8706-(120000...129999): Special Services higher rate: BT’s Standard National Call Retail Price for BT customers Read more about +44-8706-(120000...129999)
+44-8721-(010000...019999): Special Services higher rate: up to and including 10p for BT customers (non-internet) Read more about +44-8721-(010000...019999)