You could ask for an 01/02 number served as normally served through your local exchange when you sign up - there's an option for this.
So ..... my landline number is an 01327 number and my broadband voice number is also an 01327 number. Easier to remember and makes folk less suspicious of cos when ringing it. No good if you'd prefer geographic anonymity on IP calls but easier in other ways.
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BT Total Broadband
8MB and not shaped yet