I find it extremely frustrating that I can only use both data and calling features while connect to 4G services. GPS, for instance, does not work while I'm driving around and need it the most (If I'm on a phone call). Even sitting at home, I cannot receive group/picture messages or emails while I'm on the phone because I'm on wi-fi. One of the purposes of a smart phone, in my opinion, is to be able to multi-task... this is impossible if I can only be on a call, or only be on the internet, or only be on GPS. Please fix this!!!!!