Whatsapp and Viber on Iphone?

I'm getting an iphone 3gs that is of 8gb. I'm going to install whatsapp and viber on it and I was wondering if i need any kind of data plan or package or if i can use them both using just the Wi-Fi at home? Will they work properly if they are running on just the Wi-Fi and will I need any kind of plan at all to use them or will I be charged for the internet usage?

They will both work perfectly through your Wi-Fi network

You wouldn't get charged at all. Its easy and you can use them on Wi-Fi or your data if your out

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