Website says we don't have a BT Line, but we do, a...

Question

This issue is slightly complicated so buckle yourself in...
We have Virgin Cable Phone but we're disconnecting on the 29th. Before we went from O2 to Virgin we had our BT Line disconnected. 
A couiple of days ago we ordered O2 Broadband and Phone, our broadband has yet to be activated but our phone line has been activated, but that phone lnie (O2) has a different number,obviously, from our Virgin Phone Line which is still active.
So at the moment we have 2 phone numbers and 2 phone lines. When we asked O2 if we could change our number to our original one they said they couldn't do that, so we phoned up BT. I was doubtful they'd give a different response but they said they should be able to. I'm still doubtful, but they gave me an option to break the contract if they were unable to get our number.
When we asked O2 why they couldn't give us our original number they said that Virgin has the number, and they wouldn't 'release' it. We tried to cancel our O2 contract, they said we can only do that once the broadband has been activated, which I think is rubbish and just a waste of time. After I cancel I will re-order O2 Broadband (sorry BT :/) but get phone from BT, not O2 (hurrah ). So firstly, will I be able to keep my phone number, from Virgin to BT?
We decided to order our BT Phone now, even though our O2 Package wouldn't be activated until the 13th, and probrably not cancelled until the 15th or even later. But when I went onto the website to order, if I picked a -only phone- package, it said we didn't have a BT line, and I put down both phone numbers we have (Virgin Phone number which is the one I want to keep, and the O2 one.)
When I went to Broadband and Phone packages, and when I put in my phone number to check for Infinity, if I put in either my VM or O2 phone number, it works. Have I missed something or is this a problem on BT's end?
Many Thanks

Answer 1

If Virgin currently own the telephone number, then it's up to them to allow you to move it to O2. Just because you had that number with BT before, they can't do anything about it now that it's a virgin telephone number.
If you do bring your number to BT, again this shouldn't be a problem. I believe it's up to the gaining SP to contact the current owner of the telephone number and request it to be ported over.
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