Some shielded tool does not really shielded signal, and mobile phone jammer to be true, it produces interference by superimposing the signal waveform, thus significantly weakening the signal to disappear.
I do not know how many resources you can use.
Cell phone signal jammer subject to legal restrictions in some countries, as security considerations, the illegal use of cell phone signal blocker might have 10 million dollars in penalties.
On legal issues Mobile phone jammer, we can consult the local legal institutions. Not all State can use such devices.
A cell phone jammer is a device that emits signals in the same frequency that cell phones use