Best of all the switch from AT&T to Verizon was the right decision. We have found that we did get dropped calls with Verizon too. On both their map and AT&T's it shows that we are receiving good reception. Instead of arguing with us they have give us 3 fixes that helped and I will share them with you. What was happening to us was that some but not all calls would not ring and would go to directly into voice mail. The following 3 things fixed this. And they were helpful and nice.
1. Turn on Roaming on your iPhone. It does not cost any more and it improved things some.
2. PRL update (whatever that is). Dial STAR 228. Select Option 2. Do this from the location that you are having problems receiving your calls. In our case we needed to come home, be in the condo and do this. It somehow syncs our phone to the nearest cell tower.
3. There is another roaming feature but you have to go to the Verizon store and ask them to do this for you. Through their computer system they set your iPhone up to roam on other cell towers besides theirs. This is at no extra charge. It takes 24 hours to go into effect.
So far so good. Seems like all is well. Plus I sold my AT&T Microcell on ebay for $90. Microcells seem to be a hot ebay item.
All is well that ends well.