Still having this problem with the latest iteration of iOS 11. However, I noticed that everything works fine with my iPhone SE and my new V30. This makes me wonder whether the problems exist mostly with the Intel modems, because both of the good devices have Qualcomm modems. --- Post Merged, Oct 12, 2017 --- Which provider do you use? If it is AT&T or T-Mobile, your 7 will be an Intel modem while your 6 will be a Qualcomm modem.