Sorry if this is a common problem. I've searched everywhere and can't seem to find the answer. I just got this phone three weeks ago. It was working fine until yesterday. But now my mobile data connection won't work. If, for example, I try to get the hourly weather forecast or get on the internet, I get a screen that says "You need a network connection to use this application. Please turn on mobile data or Wi-Fi in settings." I've tried everything I can think of. My Mobile Network is on. I've re-booted the phone, that didn't work. I've even seen suggestions that you should turn Airplane Mode on & then off. Tried that, that didn't work. Any ideas as to what's wrong?