Voxbone and Jajah have teamed up on a dramatically simple, and very good service for O2 customers in the UK. In a nutshell, for £10 per month O2 International Favourites gives you an unlimited overseas “Call Me” number that friends and family can use to reach you at local calling rates. Calls made to that number are simply forwarded to the subscriber’s O2 handset. In addition, you also get three local dial numbers that will call forward to international landline or mobile numbers, with 3,000 minutes of service.
That ought to be more than enough for calls between friends and family back home.
More details here.