BT4000 unblocking numbers

[Mob]

We have bought BT4000 phone for my mother and she has managed to block some numbers - we cannot find info on how to unblock these numbers - can anyone help?

[HHGTTG]

Go here and download user's guide.
https://www.businessdirect.bt.com/content/uni2/documentation/8tc0/bt4000_user_guide_[.pdf

[Mob]

Thank you. I can see the guide shows you how to block calls but not how to unblock!!

[JWS]

Try page 27 of the manual posted above.
Column to the right of the main text, middle paragraph. I think that’s what you need. Looks easier than the (presumably earlier) BT 8500 models we have where from memory you can only delete the entire block list. 

[HHGTTG]

@JWS
You beat me to it. I was going to read through the manual for the OP.

[Mob]

...thank you - we will give this a go.