Can a mobile phone signal jammer only interfere with data and not interfere with calls?

It can be achieved, but it is more troublesome.

First, look at how to achieve it. The frequencies for 2G calls and data access are separated. Site surveys should be conducted to distinguish 2G signal frequencies and 4G signal frequencies, and then based on the frequency parameters of the field surveys, the cell phone jammer should be checked. Frequency adjustment is performed on each frequency band, so as to realize the function of only shielding data from the Internet and retaining 2G calls.

Second, why is it troublesome? After field surveying and adjusting the frequency range of the mobile phone signal jammer, it may be effective at that time, but after a long time, the operator may adjust the frequency, and after the adjustment, the mobile phone signal jammer after the is completely ineffective.