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Is there a signal blocker that only blocks 4G and keeps 2G?

Romo Hector 2022/07/30

  The current mobile phone signal jammer gps are full-band, which can block all 2G 3G 4G signals, 2.4G WIFI signals and Bluetooth signals under the three major operators of AT&T, Verizon, and T-Mobile. The jammer works by launching itself.

  The frequency of the mobile phone interferes with the normal frequency of the mobile phone receiving the base station, so that the mobile phone cannot be connected to the base station, so that it cannot make calls, send and receive text messages and surf the Internet normally. However, when buying a jammer, you can ask the merchant to only block 4G for you and keep the 2G call function. These functions can be set.