Currently Being ModeratedNov 7, 2013 10:11 AM (in response to bhalu)
First, please turn off the caps lock. It is considered yelling on the Internet and is rude and difficulty to read.
Regarding Skype, you would need to read the specs for the app in the App store to see if it supports the latest iOS for the 3GS which is iOS 6.1.3. The same for Viber.