NumberCheck returns the following data:

Data Example Description
Client Data (01304) 383838 as supplied in source file
Tel No 01304383838 UK Landline Number (National Format)
Response Code 100 Landline Response Code
Response Summary Live Summary Result (Live, Retry, Dead)
Response Detail Live Line status (see Response codes for detailed information)
Location Dover Geographical Location
Original Carrier BT Original Line Carrier (Ofcom)