Anyone have a Samsung Galaxy S4? If so, what update are you on and do you have any problems such as frequent loss of signal until restarting of phone, lots of dropped/failure to make calls, etc? I've done my research and it seems to be a problem for the phone and update across all carriers. Trying to get Sprint to give me a different phone as they sold me a phone that doesn't work (even after replacing antenna, SIM card, and entire phone).