The "proximity effect" of putting the finger, hand or face to the front of the 28GHz mmWave antenna will shield the signal from the Movindi CEO Maryam Rofougaran of the 5G start-up.
In this regard, we can think of the Apple Corp encountered in 2010.IPhone4 the "antenna door" event, a user's "wrong" grip will weaken the phone's signal. The same will happen to 5G phones, and even worse, it will also directly block the signal.
"Human shielding" is the most common phenomenon in mmWave academic research. In addition, because of the small size of the smart phone, the situation of shielding is easier.
There are no commercially available 5G New Radio commercially available at the moment, and is expected to be available by the middle of next year. Motorola's recent exposure of 5G mobile spy photos hints at possible changes in mmWave design for mobile phones.
Perhaps the most reliable solution now is to rely on 4G links for mobile phones, that is, making 4G a part of 5G's "double connection". In fact, in the US, most Sprint operators support VoLTE calls.