I activated service with AT&T in December and I got the 16 gb iPhone 6. I absolutely love my phone and super fast 4g LTE but, as of late, every once in a while, it will say 'no signal' on my phone for sometime as long as it takes for me to restart my phone. I know it isn't my area because, when it's working, I have perfect coverage on my phone and hot spot streaming. Also it has been force closing a lot 😞 please help!!!!