Verify that the base station causes signal jammers to block

　　Mobile phones operate at different frequency bands in different countries. For Canada, the 1900 MHz band is the primary band, particularly for urban areas.

　　850 MHz is used as a backup in rural areas. USA uses 850 and 1900 MHz bands, depending on the area. Europeans tend to use the GSM 900 and 1800 bands as standard.

　　Middle East, Africa, Asia and Oceania also use these frequency bands. In Russia and some other countries, local carriers have licenses for 450 MHz frequency to provide CDMA coverage.

　　The use of different frequencies makes it difficult to have jammer gps for all frequencies.

　　Some customers found that the shielding effect was not ideal when using the mobile phone signal jammer to shield the mobile phone, and the effective shielding range was only a few meters.

　　So, whether this is the case can be verified by:

　　Choose a cell phone jammer to test, and take it to your home or other different units for on-site testing. You will see that in different on-site environments, one is that the shielding distance of the mobile phone will be different, and the other is that it was originally thought to be unusable. The type of shielding and the shielding effect of the mobile phone will appear or increase after changing different sites.

　　In the scenario where the base station is relatively close and affects the shielding distance, place the mobile phone within 1 meter around the mobile phone signal jammer, keep the mobile phone in standby for 1 minute, do not perform any operations and run it for 1 minute, and observe whether the mobile phone signal is still there after 1 minute. Send messages, make phone calls, surf the Internet, etc. If there is no signal, it is basically certain that the cell phone signal jammer is working properly.