It is unreasonable to say that the principle of the enhancement sticker is to enhance the receiving range of the signal by lengthening the wavelength of the signal received by the built-in antenna of the mobile phone. Hou Hua, Technology Transfer Center of Hebei University of Engineering, said, first of all, wavelength can't be "stretched" in real life; Secondly, it takes energy to amplify anything. Stickers are "passive antennas" and cannot provide energy for effectively amplifying signals.
"The strength of the mobile phone signal is mainly related to the distance between the mobile phone and the base station and the occlusion." Hou Hua introduced that, for example, in a few buildings, corridors, basements and other areas with complex structures, the signal intensity is greatly reduced after the attenuation of layers of walls, which may be difficult to meet the business needs and lead to unstable signals.
On the other hand, when most users around use the same network operator, the number of people increases sharply, and everyone grabs signals at the same time, so the number of users that the base station can serve at the same time is limited. At this time, network congestion may occur, resulting in call failure or voice interruption.