I Posted this subject in the Note 4 forum as well. I have an old Droid Razr Maxx that is rock solid, has great reception and very reliable. I bought a note 4 late last year I think it was and brought it home home....abosutlely no and I mean zero bars of reception wher eI always had 2-3 with the Razr and my wifes iPhone has 2-3 bars...fussed with that for the day and refuse to fuss more with a phone I paid hundreds of dollars for so I sent that right back to Verizon and reactivated my Razr. Well the note 5 came out and supposedly much better so I jumped on it...what the hell I like what it has to offer so again I toss my razr aside in hopes that the note 5 will meet expectations. Bring it home last night still a piece of junk with absolutely zero bars and no reception at my house. You would think such a large phone would have a large antenna surface area and would at least have the same if not better reception than smaller phones. At my house mind you I do roam on A Canada cell tower that our other phones have zero issues with expecially in Global mode. Guess what another note 5 will be heading back and I will not be trying another. What good is a fancy expensive phone when the cheaper models work better!! Frustrating....
How is your 4G / LTE coverage?
One thing you could try is turning on your Voice Over LTE (VoLTE). VoLTE allows you to make phone calls over the data connection instead of the CDMA radio.
In Avon, OH, as I sit here typing this message I am picking up 3 bars, but I have my VoLTE turned on. On LTE, I am picking up a strong 20 MBPS signal which provides for great audio quality.