Here you can find your own jammer

A 63-year-old man named Dennis Nicholl, who lives in Rogers Park, has been charged with deliberately jamming cellphone signals during his Red Line commute. His intention was to create a quieter environment for himself. As a resolution, Nicholl will undergo counseling and is likely to avoid facing criminal penalties.
Reddit users have given the moniker "The Red Line Jammer" to Nicholl, who has now agreed to a deferred sentence on misdemeanor charges. These charges were filed against him for utilizing an illegal device to interfere with cellphone signals on the L train. According to Charles Lauer, Nicholl's attorney, it is likely that the pending misdemeanor count will be dismissed during his next court appearance in June.
Accompanied by another lawyer, Nicholl swiftly made his way out of the courthouse, choosing not to engage with the inquiries of the press.

Images of Nicholl operating a tiny signal-blocking device that he had unlawfully bought from a Chinese manufacturer had been circulating on the Internet prior to CTA officials receiving a tip about Nicholl. A collaborative sting operation involving the CTA, Chicago Police, and the Federal Communications Commission was launched in early March, leading to Nicholl's apprehension after activating the jamming device while an undercover officer was speaking on his cellphone in Nicholl's car on the Red Line.
Nicholl's arrest on March 7 aboard a Red Line train led to his overnight detention in jail, awaiting a bail hearing. Initially accused of a felony charge for interfering with a public utility, this charge was later amended to a misdemeanor earlier this month.
Lauer revealed that Nicholl had been caught jamming signals on the L line in the past, but he did not face any real consequences and received much less media attention than he did during his recent arrest. The mild-mannered accountant, who only wanted some peace and quiet on the L, has since faced difficulties at work, as per Lauer.
As per Lauer, his sole intention is to retreat and stay out of sight.
He was conscious of the fact that it was against the law, though he didn't perceive it as a serious breach. It was more akin to being issued a traffic ticket.
Hopefully, he won't let it affect him if others bother him.