Can't use wifi signal, then can I use Bluetooth or cell phone?

Can not. With the advancement of technology, the current wifi jammer has achieved full frequency break coverage, signal bands including 1G-5G signal, as well as WiFi, Bluetooth, all shielded with one key.
Currently near all kinds of examinations, school-specific wifi signal jammer must be front. There is also the shield radiation is very small will not harm the human body, please feel free to use.