I have BT6600 For some reason my 93 year old mother's number has been blocked. Been to My BT to get list of blocked numbers but this stops in early may.73 blocked numbers so not full. Help
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I think this is the relevant section from the BT6600 User Guide, particularly the box which I've highlighted:
Hope it helps!
Thank you after an hour two going in circles have succeded. Wife is at her mothers has just rung me back. Thanks again.
Glad your perseverance has paid off.