According to Skype’s blog post. They support Skype calling through Iphone with 3.1.2 IOS, I’m giving it a try and will do a test. By the way Here below are the Blog posted on skype and also the Download link where you can install the Skype 3.0.
My iphone is 2G with Jailbroken firmware of 3.1.2 IOS.
Happy Holidays season - hohoho.
This season is very special as we are releasing a new version of Skype for iPhone and iPod Touch with video calling. Now you will be able to share all the special moments in video, as they happen, wherever you are.
Download the app straight from iTunes and let us know what you think about it on our forums.
Skype video calling is supported over WiFi and 3G* data connections. You can enjoy video calls with users on all Skype desktop versions and with other Skype for iPhone, iPod Touch, and iPad users.
You can make video calls in both portrait and landscape mode and use both front and back cameras.
Users on iPhone 4, 3GS and iPod Touch (4th Generation) can enjoy full 2-way video calling. Users with iPod Touch (3rd Generation) and iPads can receive video.
Video calling with Skype requires iOS 4.0 or above to be installed on your device. Skype 3.0 for iPhone will also work on iOs 3.x, but without video support.
Full release notes for Skype 3.0.0 for iPhone:
* Video calling
When receiving a video call on iPhone from Skype 2.8 for Mac user, the only options presented to the iPhone user are Accept and Decline. The incoming call will appear as an audio-only call. \\
Once the call is established, the iPhone user can click "Video call" to start video.
iPhone 3G running iOS 3.1.2 will briefly go offline after the other person ends a Skype call.
Online status is automatically restored after a brief period.
When an iPhone (iPhone 4, iPhone 3GS, iPod Touch 4th Gen) calls a device without a camera, the audio is routed through the loudspeaker. However, the speaker button is not highlighted.
Toggle the Speaker button.
If you place a Skype call on hold while using the back camera, resuming the call will switch to the front camera.
Press the camera button to select back camera.
Starting video while on hold during a Skype call causes the call to fail (cannot resume from hold).
Take the Skype call off hold before starting video.
Ringing sound plays through the earpiece instead of the loudspeaker after call has been answered the first time.
Restart Skype application.
Skype running on iPhone 3GS with iOS 4.2 does not automatically place a Skype call on hold when an incoming GSM call is received.
When declining an incoming GSM call, the Skype call audio is lost.
Place the Skype call on hold and un-hold, to return the Skype call audio.
* - Additional Data charges may apply.