Sky text message service centre numbers - what are they?

I need to setup my BT phone with the message centre numbers that are used by Sky to send and receive text messages.

I have been speaking to Sky for 30 minutes and they cannot (or will not) release the numbers. I was told that Sky do not offer the facility of sending and receiving text messages despite their own website saying that Sky Talk DOES provide this service!

is anyone able to provide the service centre numbers used by Sky to send and receive text messages?

thanks