Globe7 Offers Cheapest International Calls
Globe7, its an U.K. based company. Globe7 Phone enables you to make Free PC-PC Calls and cheapest calling to any landline or mobile across the globe. You can also get the benefit of Instant Messaging!
They provide their own free downloadable software.
To make cheap International calls by using Globe7,
i) you need to Download their free software ---> Click here to download
ii) To check the rates offered by them ---> Click here
They offers cheap SMS too.