Using multiple mobile phones with multiple frequency bands to test the shielding effect of cell phone jammer on site is a convenient, trouble-free and feasible test method. Compared with the limitations of passing the mobile phone test software, and the need to convert after passing the professional instrument test, this method is easy for users to grasp. Methods as below:
Prepare mobile phones with multiple frequency bands, including: China Mobile, China Unicom, PHS, 3G (There are three types of 3G: Mobile TD-SCDMA, China Unicom CDMA2000, Telecom WCDMA), and then turn on the mobile phone signal jammer, hold each mobile phone, Test the effective shielding radius of the mobile phone jammer from near to far. It is recommended that the user should test the shielding distance in multiple directions from the jammer at the same time.
When checking whether the mobile phone is blocked, you should pay attention: You can't just check the signal grid number on the mobile phone, because the signal grid number on the mobile phone is sometimes false, and you should dial the mobile phone intermittently. You can try to dial a local toll-free number or a fixed number. If the landline number cannot be dialed, it is judged to be still in the shielding range, otherwise, it means it is out of the shielding range.