Do you have privileges to inside information ? I have not read of such from the phone's manual. I suppose this applies to digital cameras as well ? The phone and camera can detect the present status of a battery (power wise), but once the device is switched off, the data are gone. But then, perhaps you can provide an official source to that information ?
We still need to do a complete charge and discharge cycle once in a few months; not for the battery, is for the phone. Li-Ion does not have memory effect, but the phone has memory to tell when is full and when is empty . By charge and discharge cycle, it calibrates the phone's memory to show the correct amount of charge. Otherwise the phone will stop working even it shows a full charge.