We have 2 Samsung Galaxy Note 9's purchased (paid off) from Verizon and have them for over 2 years now but a few months ago we added a Verizon 4G LTE Network extender to get more than 1 bar of reception in our home.
It seems like since then when we get calls it sometimes rings twice on the callers end and goes straight to voice mail. But we don't get a ring or even a missed call notice. If a voicemail is left it sometimes takes hours to show up.
I call my wife on her Note 9 from my Note 9 (same account) from work during the week and it happens quite often... "Sometimes" I can text her and then call back and it goes through.
Have also had text messages take hours to show up.
Our daughter lives out of state and has a non-Verizion iPhone and gets this when calling either of us quite often.
I have switched off of Global network to LTE as one Verizion post suggested being on the Global network at times can cause issues.
Paying you all over $200 a month for this craptastic service is sure leaving a bad taste in my mouth.