Another supplier you can use to avoid VM expensive call charges is the
www.phone.coopThey give you an 0800 access number to use from your landline line.
0845 calls are 3.95p/min peak 1p/min evenings and 1p weekends.
0870 calls are 3p/min peak, 2.5p/min evenings and 1.5p/min weekends
0844 and 0871 calls are as advertised BT per min rate (ie between 0.5p and 10 per min).
Their is NO CONNECTION FEE.
Minimum charge is just 1.175p per call with per second billing. Evening starts at 6pm and ends 8am .
No subscription fee/monthly charge with the Phone Co-op's Caller Plus tariff.
See:
http://www.thephone.coop/support/landline-support (5th question)