<Tr> <Th> #31 #</Th> <Td> Withhold number </Td> <Td> 141 equivalent for use on mobile networks </Td> </Tr> <P> Many fixed line telephone subscribers, e.g. BT, Virgin Media, SkyTalk Sky, TalkTalk and PlusNet have the opportunity to use an automated messaging service which takes messages when the called number is either engaged ("busy") or not answered within a given time . This can be accessed by calling 1571 . </P> <P> For fixed line users, it is possible to override the carrier pre-selection (CPS) on a per - call basis, dialling a special code before the number, e.g. 1280 for BT, 1664 for LowerCall, or 1844 for Daisy . Ofcom defines the range for these as: "124 to 140, 143 to 146, 148 to 149, 160 to 169, and 181 to 189 inclusive . Numbers of up to 5 - digits used to access an Indirect Access Provider (' Type B Access Codes')". </P> <P> Telephone numbers in British Overseas Territories do not come under the UK telephone numbering plan . These calls are treated as international calls . Below are the access codes for the overseas territories: </P>

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