You can instantly try their free trial phone to phone call from their website. But this service is available if you and the destination number both are in their free countries list. This list includes about 40 countries.
- Type in your phone number
- Type in your friends phone number
- Click "CALL"
They offer free minutes per week when you register on their site. If you want more free calling minuted you may register for another account using some other email id as well as using proxy. I guess they log your IP address. I suggest you using China proxy.
For more info, check out their website.
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