Why pay a monthly fee to Vonage? If you need an incoming number, go to
www.sipgate.co.uk, free, and if you need an outgoing line, go for one of the betamax services - also free for most destinations, and is prepaid for the others, so you pay only for what you actually use. I have used the combination for years now, the only time I regreted not having a virgin landline was when I had to call their stupid and useless 0906 technical support.