Will there be radiation when the mobile phone signal is shielded, and is it harmful to the human body?

Regarding radiation, as long as electronic products are large and small, there will be radiation. Any piece of electrical equipment will have radiation. Just like the mobile phones we usually use, it is inevitable that there will be radiation when leaning against our ears every day. The country has also set a standard for mobile phone radiation, and the radiation generated by our cell phone jammer is much lower than the national standard, and it is not every day. Leaning against the ears, so there is almost no harm to the human body.