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If you dial the phone from the unshielded area to the shielded area, you will often walk into the shielded area for a considerable distance before the phone is completely shielded. This is because once the phone is dialed, the phone itself has the ability to resist interference. This kind of anti-interference will make the mobile phone adjust its transmitting Power to ensure the normal call this time. Therefore, it is generally not recommended to perform dynamic testing in the call state, but to perform static testing at various points. After testing multiple frequency bands, select a frequency band with a short shielding radius as the effective shielding radius of How To Make Your Own Cell Phone Jammer in this area. This can be used to estimate the location when deploying large-area honeycomb dots.