This has now happened to me a several occasions, so I'm now wondering if anyone else is encountering it. Sometimes, even though I show a strong 4G signal, my phone will claim no data connection. I've had this happen on other phone, but could usually get by it by either turning wifi or airplane mode on/off....but with this phone i have to reboot. I hate rebooting.....brings me back to my early Blackberry days. It's to be expected once in a blue moon setting up a new device, or when making a lot of changes, but this is daily use. Upon rebooting, my data issue is gone. BTW....I'm on Verizon. I've had similar issues with Wifi, but that could just be my ****ty router, so I'm not convinced that's the phones problem yet.