Apologies if this is me being braindead.
I'm switching back to BT (shouldn't be relevant coz I noticed this before I'd made the call) and on their website is says if you plug a phone into the BT Master socket and get a tone then you don't have to pay anything for reactivation. So I plugged and phone in and got a dialtone, all well and good, so then I rang my mobile and it said my Virgin number was calling! I may be thick but the BT master socket hasn't got anything to do with the Virgin line, so why would this be? I can't remember what the Virgin (telewest at the time) did to install the line. The socket I normally plug into, runs under the skirting and I can't see where it goes to.
Any thoughts (even if it's telling me I'm stupid and I should remember what they did at the time)

Thanks.