I recently upgraded to the Samsung Galaxy Note 4 with Sprint. I am amazed at every single feature except that of the phone itself.
It might be possible as Samsung has pushed the limits of the digital camera, the GPS, the Apps, etc., that they had to give up something and it appears that it is in the phone's signal quality itself. I was shocked to have the folks at Sprint tell me that I should try turning off the LTE signal (dropping it back to a 3G phone) to improve the phone's performance as a phone!
Upon further review of the specs on the phone, it seams that for some reason, you can no longer use LTE or their "Spark" network for data simultaneously with the phone as a phone. In other words, I can't be taking a webinar online on my phone or watching a video and accept a phone call!
I will be dropping by a Verizon store and testing that out on their service since it might just be a Sprint issue.
I "upgraded" from a Galaxy Note 2, but as a phone, I think it was a lesson in regression analysis. As a mini tablet, I love it. I welcome comments on how other people like theirs.