I've been having a similar problem where in usually strong LTE areas, my phone shows H+ and has such a weak signal on most calls people suddenly stop hearing my voice and several times the call drops, even cannot sometimes answer or dialout right away it seems the phone is taking time to connect to carrier network (Bell in Calgary, AB, Canada). Bell helped me troubleshoot and narrow down to find out it's my Samsung Galaxy Note 5 device, as my wife's S6 works fine in the same areas, same carrier...Bell mentioned a few Note 5 users have come in with similar problem and they think it's due to a recent Samsung patch/update speciically to Note 5's....any other Note 5 or other Samsung phone users experiencing similar issue?