I have just purchased the s7 slim , my data connection is switched on and wi-fi off but everytime I open the browser it says can't connect , no wi-fi connection!
Settings -> Wireless & networks -> Mobile Networks -> GSM/UMTS Options -> Access Point Names
There should be an APN listed and enabled, if not you should contact your carrier and get the settings from them. To create a new APN just touch the "Menu" key and add the APN with relevant settings from your carrier.