What happened to the dbm signal strength display following iOS 11 upgrade?
Following iOS upgrade, the signal strength meter, which was previously set to display dbm signal strength for the mobile phone signal has reverted to bars.
WHY?
http://www.zdnet.com/article/your-iphones-has-a-hidden-signal-strength-meter/
This no longer works after the iOS 11 upgrade! And using the previous code set of *3001#12345#* no longer works to activate this feature.
iPhone 6s Plus, iOS 11.0.3