I iPhone 6s+ owner here with iPhone 7+ on order. I wish some of the reviewers would cover the voice quality when using the iPhone as a phone. The iPhone 6s(+)

I iPhone 6s+ owner here with iPhone 7+ on order. I wish some of the reviewers would cover the voice quality when using the iPhone as a phone. The iPhone 6s(+) added another microphone for noise cancellation and also it uses H.265 for FaceTime Video compression over cell networks (2x H.264 compression) and one is able to use VoLTE (I'm on Verizon). But I'm always looking for better cell phone quality. I actually received a phone call while just to about to get on a NYC subway, 1 story below ground and the person couldn't wait until I took my subway trip, so we chatted for awhile while several subways passed both uptown and downtown (they come every 3 - 5 minutes in each direction). She claimed she could here me speaking just fine even when the subway is arriving :-) But sometimes, people have trouble hearing me on the iPhone and on the Apple $80 in-hear microphone. I'm curious if there are any upgrade to the iPhone 7 that improves the voice quality and I wish at least one reviewer would test this out. Also, as an aside, I'm disappointed that the iPhone 7 doesn't cover band 66 (AWS-3) spectrum. I guess there aren't any modem chips out yet (at least not from Qualcomm which is what the Verizon and Sprint CDMA phones use). Still in dense markets like NYC, even though Verizon has far more spectrum than AT&T, I expect that in the next year or two the existing spectrum will be filling up. I've been using the iPhone leather case since the 5s (when it first came out) and I've only had one screen break.