Rebtel allows you to use your inclusive mobile minutes to make international calls (or make international calls at local rates) by providing you with a local number for each of your overseas contacts. Find out how by watching the two minute movie ‘your mobile operator doesn’t want you to see’! Rebtel uses the power of voice over the Internet (VoIP) to circumvent the mobile operators’ international call charges. It’s a great product that really works!
You can use Rebtel from your landline as well.
The Rebtel blog is also worth following.