|The app easily integrates and uses your phones contacts list. So no need to hassle over creating new contact lists.|
If you have an android smartphone (Android 2.1 and up is required) and a decent Wifi at home then you're good to go. My DSL is only about 80mbps. My 3G+/HSPDA+/4G is only is only slightly faster. Using simple and easy Geekaphones Mobile Speed Test I found out my download speed to be 1.12mbps and upload speed of 0. 48 mbps (with 2-3 bars on the connection strength). Using my Data to make a phone call was a little less clear than normal dialing, but that isn't a big loss for using other resources to dodge overages. If only I had quicker high speed internet I'm sure the phone call quality would had been great. My mom likes calling overseas and this service would definitely be better than constantly buying phone cards.
The free trial gets you 60 min FREE to any of their supported 60 countries. After that you can purchase a plan for a select number of countries starting at $4.95. If a country is not in those plans or you use up your minutes in that plan, then each minute is charged the international rate for that country. International rates are low. Countries with varying discount plans include U.S., Canada, Brazil, Mexico, India, U.K, Puerto Rico, and Vietnam. Again a feature with the app is unlimited VoX to VoX Mobile users. You're VoX account will have a different number that you can use to send and receive calls. The Free plan can only send outgoing calls.
To be honest I do not use that much of my regular plan minutes and have not thoroughly tested the app(it has many features), but if you have any questions, their website is really user friendly. (http://www.voxcorp.net/). The smartphone applications user interface is nice and neat. It doesn't need syncing or setting up to use. Just make sure your carrier supports free VoIP(using internet to make calls) so that you don't get charged for that. Most big carriers like AT&T and Verizon let you use VoIP.
An example of the international rate:
United States and Canada $0.029 per minute (maybe that means $0.03/min) $4.95 plan gives you 500 minutes vs that rate which would give you 170 minutes. As a comparison my standard ATT rate is $0.49/min(and that's for non international calls).