I had the same issues, dropped calls, no connection and data failure.  Sometimes it would be days before I received a text and sometimes I would reboot and 20 messages would come in, I never knew when it was happening.  I have returned my unlocked Note 10+ 3 times and the last time they kept the phone and it is now supposedly a return/exchange issue.  I have been without a phone for a cumulative 6 weeks, 3 1/2 weeks this time.  No one has called me- they keep saying someone will call me to discuss the next option but I have not heard from anyone except for emails from Samsung support telling me to send them my original receipt (It was purchased directly from them but they say they have no way of looking that up??) and to send in my phone. (which they already have, that has been verified).   I feel like I have been given the run around constantly.  I never had issues with my Galaxy 3, 5 or the Galaxy 7 I am using now in place of the Note 10+.  I have been an adamant android defender and Samsung particularly but I an certainly re thinking that stance due to my experiences.  My husband has been an iphone person all these years and is giving me a large amount of grief now that I am experiencing this issue with no resolution.  I am extremely upset with Samsung and wonder what kind of offer I will be getting for an exchange.  I expect to be compensated for the 6 weeks I have been without a phone, the S7 Galaxy was a great phone but it is so s l o w!!!  We will see what happens. ... View more