Does 67 Block Cell Phone Numbers
There is no way to prevent it. Does 67 Block Cell Phone Numbers is the so-called signal jammer, which can shield all communication signals and cannot be prevented. Effectively shield CDMA (China Telecom), GSM (China Mobile, China Unicom), SCDMA (Netcom Da Lingtong), DCS (1800MHz), PCS (1900MHz), PHS (Telecom PHS), 3G mobile phone signals, WIFi and 4G mobile phone signals Wait for all communication signals. The principle of mobile phone (radio communication) is as follows: within a certain frequency range, the mobile phone and the base station are connected by radio waves, and the data and sound transmission is completed with a certain baud rate and modulation method. In view of the above-mentioned communication principle, the mobile 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. The mobile phone is manifested as a search network, no signal, no service system and other phenomena. cell phone jammer
Because the school’s mobile phone jammer works by shielding the mobile phone by interfering with the mobile phone jammer 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 can only shield the mobile phone signal of 900-1800MHZ. The receiving and transmitting frequency of the mobile phone is 850—1900MHZ is much larger than the shielding range of Does 67 Block Cell Phone Numbers, so as long as the receiving and transmitting frequency of the mobile phone is adjusted to the maximum in the mobile phone settings, 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 most concealed. The premise is that the mobile phone must have wifi wireless Internet access function and there must be an available wireless network around (it is almost impossible in our first high). After searching for and successfully connecting to an available wireless network with a mobile phone, even if the mobile phone has no signal, it can still surf the Internet without traffic.