4G is a combination of 3G and WLAN that allows you to quickly send data, high quality, audio, video, and images. 4G can be downloaded at speeds of over 100 Mbps, which is 25 times faster than home broadband ADSL (4M), and can meet the requirements of almost all users of wireless services.
In addition, 4G can be deployed to locations where DSL and cable modems are not covered and then expanded to the entire region. Obviously, 4G has unparalleled advantages. However, there is no need to make a phone call in the examination room, conference room, or church. At this time, it is not necessary to use 4G signals.
Therefore, before you buy a signal shield for your 4G mobile phone, you need to pay attention to some specific factors.
1. Frequency range. Shielded frequency band: CDMA800, GSM900, SCDMA1800, DCS1800, PHS1900, TD-SCDMA, CDMA2000, WCDMA.
2. Area used. The shield range of 3G / 4G phone jammer is based on the power of the jammer. When tested in the field depending on the strength of the local environmental signal, the shielding range will be different. For example, the weak coverage of indoor traffic lights increases. Outdoor accessories include the GSM base station. Therefore, the GSM signal is close to the outdoor shield range!
3. Power size. As everyone knows, 2G, 3G, 4G, wifi jammer: Before you buy, you need to know the signal to block. Normal mobile phone signals (234G) can be selectively blocked. If you want to block only 23G or only 34G, this is fine. There are 2.4GWIFI, 5.8GWIFI and other frequency bands tuned before shipment. In general, normal signals can be shielded quickly.