Is it possible for 67 block feature to completely block all communication signals from cell phone numbers?

Perfectjammer 2021/11/29

Does activating 67 block completely block all communications from your phone number?

There's no way to stop it. 67 Blocking mobile phone numbers is the so-called signal blocker, which can block all communication signals and cannot be prevented. Effectively shield CDMA (China Telecom), GSM (China Mobile, Unicom), SCDMA (Netcom Big Smart), DCS (1800MHz), PCS (1900MHz), PHS (Telecom PHS), 3G mobile phone signals, WIFI and 4G mobile phone signals waiting for all communication signals.

The principle of mobile phone (radio communication) is this: in a certain frequency range, the mobile phone and the base station are connected by radio waves, and the transmission of data and sound is completed at a certain baud rate and modulation.

In view of the above-mentioned communication principle, the cell phone jammer scans from the low-end frequency of the forward channel to the high-end at a certain speed during operation. This scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station.

Mobile phone search network, no signal, no service system and so on.

Because the school's mobile phone blocker blocks the mobile phone by interfering with the mobile phone blocker in the specified frequency band, as long as the receiving and transmitting frequency of the mobile phone is modified so that it is not blocked, the mobile phone blocker can only block the mobile phone signal 900-1800MHZ.

The receiving and transmitting frequency of the mobile phone is 850-1900mhz, which is much larger than the shielding range of the 67 shielded mobile phone number, so as long as the receiving and transmitting frequency of the mobile phone is adjusted to the maximum setting, the mobile phone signal can be received normally.

This method has relatively high requirements for mobile phones and the environment, but the effect is the best and the most hidden. The premise is that the phone must have wifi wireless Internet access and must have a usable wireless network around it (almost impossible in our high school). After searching for and successfully connecting to an available wireless network with your phone, you can still surf the Internet without traffic, even if your phone has no signal.

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