So I noticed lately or since I started using wi-fi calling that once I walk outside of range from the router I can't get no service at all? Now I knew that this phone didn't support UMA but I am stepping outside of range and can't get any service whatsoever. Its like the entire phone connection is getting shut off somehow? I turned wi-fi off and had no luck. It was very frustrating, I thought maybe a tower went down but my mom's t-mobile phone had 5 bars. Long story short, I restarted the phone and it was fine. This is the second time I had to reboot to fix this. Is there a way to resend the service books or something? Thanks