Good news to iPhone 4 users. There is one more option for video call other than the standard FaceTime. Fring app has been approved by Apple and you can download it and start making video calls over 3G.
It is good that Apple did not restrict third party vendor in using the front camera for video conferencing.
Gizmodo did a test and here are the results
Depending on what type of connection you use and who you call, the video quality changes.
- Fring Wi-Fi to Fring Wi-FI: Best case scenario, with slight voice delay but nothing major
- Fring 3G to Fring 3G (or Wi-Fi): More noticeable voice delay, but video quality doesn’t degrade THAT much
- Skype Wi-Fi to Skype Computer: Not too shabby, with decent voice delay and relatively OK video quality
- Fring Wi-Fi to Fring Wi-Fi on Android: Strangely, we could only get voice one way, so one person couldn’t hear the other person. Could just be a bug or issue with our network configuration
Anyway, now you have a choice to call to other phone type instead of just iPhone 4.
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(source)