I don't have data on my plan but am hoping to use whatsapp and kakaotalk with my wifi connection. (samsung galaxy ace II x) I have never tried putting my wifi on because I'm convinced that it will cost me data. Questions: 1. Is it free to download these apps through WIFI (and blocked data)? 2. Can i only text through these 2 apps uing WIFI or can i also send pictures using only wifi?