Some jamming devices transmit radio signals in the 800MHz frequency band, which is used as the mainstream carrier frequency band for NTT DoCoMo and KDDI au phones. Of course, there are interference products in other frequency bands. Currently, the main corporate users of mobile phone jammer devices are hospitals, concert halls and movie theater operators, and even some banks install devices on ATMs to prevent "trouble" or scams. The honorary professor of Bangor University in the United Kingdom said: "GPS has been deeply embedded in our society's transportation, manufacturing and economy, so it poses a high risk." David Last (David Last) said. Nowadays, cell phone jammer devices have become private sector products, rather than electronic warfare devices. This is because with the increase in the number of mobile phone users, there is an increasing need to disable mobile phones in certain areas where mobile ringtones are annoying. These locations include places of worship, university lecture rooms, libraries, concert halls, conference rooms and other places where silence is allowed.
The 3G mobile phone signal jammer is designed with a good cooling fan system, so the 3G/4G mobile phone signal jammer is always in good working condition. High temperature will damage the 3G mobile phone signal jammer, and will not affect the use. Therefore, one aspect that people consider is that the interference power range of 3G signals is very large. If you don’t have to worry about the high interference capability of this 3G phone, you can easily use it as a church, theater, concert hall, classroom, book, museum, bank, museum or other noisy places, so that the jammer is reasonable Applications. Appear where they should appear.