Can i put just data on my iphone?

I have a nice phone that i'm happy with (not a iphone).So my dad got a iphone 5 and gave me his iphone 4. I don't need a phone i on iphone i only want data. Can i do that?

Well I guess you could just turn off Wi-Fi & never use it though I don't see the point. You pay for data usage vs Wi-Fi usage which is usually faster & free, so I'd be looking to use Wi-Fi wherever possible vs 3G/4G.

Yes you can. Buy a new sim and get a deal with free calls and text say about 500 mb or 1gb. That would be plenty. Remember always use wireless router in the home

No, phone companys would go out of business if they only had data without voice. Your best options are Wi-Fi text message programs.