How can the interference of the mobile phone grabber on the signal be removed?

Method 1: Due to the rapid development of wireless networks, it has now developed to 4G networks, and many of them are mobile phone grabber with older models, which can only shield 2G networks such as PHS, China Mobile, and China Unicom. However, for 3G and even now The 4G network is helpless, the cracking method: use 3G or 4G card.
Method 2: Band cracking method. Because the working principle of the mobile cell phone jammer is to shield the mobile phone by interfering with the mobile phone signal of the designated band, so long as the mobile phone's receiving transmission frequency can be modified to prevent it from being shielded, the mobile phone jammer only shields the mobile phone signal of 900-1800MHZ, and the mobile phone receives the transmission The frequency is 850-1900MHZ is much larger than the shielding range of the mobile phone jammer, so as long as the mobile phone's receiving and transmitting frequency is adjusted to the maximum in the mobile phone settings, the mobile phone signal can be received normally.
Method 3: WIFI cracking method. This method requires relatively high environmental requirements, provided that there must be an available wireless network around. Some mobile phone grabber cannot shield WIFI signals and can realize normal communication.
Reminder: The mobile phone jammer adopts the latest Israeli interference technology to generate constant electromagnetic signals, covering mobile communication GSM, CDMA, GPRS, local call, and PHS frequency bands, so that mobile phones cannot be used in certain places, so as to solve Some negative effects in life due to mobile phone signals. For example, installing mobile phone grabber in conference rooms, courts, concert halls, museums, recording studios, churches, hospitals, theaters, classrooms, libraries and other places can restore the original quiet and serious atmosphere.

The working principle of a mobile phone grabber is to use a frequency within a certain range to shield the mobile phone signal. It is equivalent to completely isolating the mobile phone signal in a certain space (common mobile phone jammers can do it, and the high-precision can be 99.99999% signal shielding). Not only mobile phone signals, but also wireless transmission signals in some frequency bands will be shielded and adjusted.
So don't believe these trails, or even selling anti-shielding wireless headphones, it is completely impossible.
Of course, there is a way to get rid of it, which is to use another frequency to destroy the frequency of the mobile phone jammer. The method can refer to Hollywood blockbusters: use aelectron gun to shoot into the sky, (that is, the kind of gun head that constantly emits electric sparks), and then the atmosphere surges and lightning starts (by the way, if a lightning strikes during the exam, there will The signal may be unshielded), all electronic devices within one kilometer around are not working properly...Then, the shielding is lifted.