Signal jammers for cell phone can block the following types of signals:
1. Mobile communication signals: including 2G, 3G, 4G and 5G mobile communication signals.
2. Wireless network signals: including Wi-Fi, Bluetooth and other wireless network signals.
3. Satellite communication signals: including GPS, Beidou and other satellite communication signals.
It should be noted that the shielding effect of a mobile phone signal jammer is affected by many factors, such as the power of the signal jammer, the placement of the jammer, and the electromagnetic interference of the surrounding environment. Therefore, in actual use, selection and adjustment need to be made according to specific conditions.