Is there a way to use a smartphone without using ANY data?

Is it possible to automatically disable any data use on an iphone? I don't need data while i'm not connected to Wi-Fi, but from articles I have read it sounds like my phone still uses it for things like email. Is there a setting that says "don't do it unless there's Wi-Fi"? SMS and calling doesn't use data and thats all I need when i'm not at home.

I don't know what type of phone you have so can't say for sure. I have an iphone and with it I can turn data off. However your assumption that SMS doesn't use data is wrong. ANY thing you do other than calling is data related. Wile I was on a recent trip I enabled SMS when Wi-Fi wasn't available. Every time I used it the data usage register showed an increase.

There shud be a buton for that