How to install skype, viber, facebook etc on my Iphone 2g 8gb?

I have iphone 2g. With iOS 3.1.3
I'm not familiar with it.

Just go to the App Store, find them & download them. However there's a good chance that none of those apps will be able to work with the 2G on 3.1.3 anymore. Apps have minimal iOS requirements & if they require a version higher than 3.1.3 then you are out of luck.

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