Samsung Galaxy S4 Error - SIM Card Removed - Unable to detect your SIM card.
I upgraded to Android 4.4.4 in November. Since that time I have be plagued with the same error "SIM card removed. Unable to detect your SIM card. Your device will restart to check for your SIM card." I have checked my SIM card, I've replaced my SIM card, and have refreshed my OS. I am convinced that the problem is software related. I ocassionally will be able to reboot my phone and find that the SIM card is recognized just fine. Other times, I need to reboot and restart my phone several times for it to reboot sucessfully.
I am frustrated because I take excellent care of my phone, I keep it in an Otterbox case, I've never dropped it, and it remains clean (dust-free). AT&T claims it's a hardware problem and it is out of warranty so I should replace it. However, it's only 1 1/2 years old.