A 30 dB drop can both not change how many bars are displayed at all or get you down to no bars at all. If you have a signal strength between -51 dB and -61 dB and the signal drops 30 dB five bars will still be displayed. If you have a signal strength between -83 dB and -91 dB and the signal drops 30 dB you go all the way from five bars to zero bars.
What AnandTech found seems consistent with what Apple writes. More or less, at least. The drop in signal strength when holding the phone is a bit larger than with other phones (and previous iPhones), but not dramatically so. That’s the only thing Apple is still quiet about.
A 30 dB drop can both not change how many bars are displayed at all or get you down to no bars at all. If you have a signal strength between -51 dB and -61 dB and the signal drops 30 dB five bars will still be displayed. If you have a signal strength between -83 dB and -91 dB and the signal drops 30 dB you go all the way from five bars to zero bars.
What AnandTech found seems consistent with what Apple writes. More or less, at least. The drop in signal strength when holding the phone is a bit larger than with other phones (and previous iPhones), but not dramatically so. That’s the only thing Apple is still quiet about.