If You Had A Twin, But Didn't Realise...
Family Life21 mins ago
No best answer has yet been selected by Dom Tuk. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Try asking BT if they have fitted a DACS (digital audio carrier system) to your line. Its a bit of kit which allows 2 telephone lines to use one pair of copper wires. BT use them as a supposed temporary solution when they are short of line plant in a particular area. Unfortunately it slows a 56K dial up by half but does not affect a normal voice call.
If you do have a DACS fitted, then apply for broadband, even if you cancell it at a later date, they have to remove the DACS before broadband will work.
BT are supposed to check that a line is not used for the internet before they fit a DACS, so I would doubt that you do have one fitted but its worth asking, just in case.