Do you mean you are thinking of changing your broadband supplier from NTL to a telephone based one? If so, and you buy an ADSL modem/router then yes, can share the connection. If you buy an ADSL modem that connects through an Ethernet port (NOT USB) then you should be able to use your existing router.
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Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.