VoIP has some major limitations. Firstly, a Wi-Fi connection is required. No 3G or GPRS network can be substituted for a Wi-Fi connection. Thus most iPhone apps are unusable over your cellular data connection.
After you do have a Wi-Fi connection, then the problem of who you are calling is presented. Most of the apps or software only permit free calling to others who are also using the same app. Hopefully in time, VoIP will become a more convenient way of calling friends and family.
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