Here you can find your own jammer

Anxious man uses cell phone jammer to block conversation on bus
Although it may appear to be a walkie-talkie, this compact device is far more potent than one might assume. When a cell phone jammer is operational, it has the ability to obstruct cellular service in the surrounding area. Engaging in the use of a cell phone jammer constitutes a federal offense, which can lead to fines reaching $16,000 and possible incarceration.
Nevertheless, Eric from Philadelphia remained undeterred, having become exasperated with the constant noise from cell phone conversations on SEPTA's 44 bus. When he prefers not to listen to the discussions, he resorts to using a jammer, according to NBC 10 in Philadelphia.
In a conversation with NBC 10, Eric expressed that many people are excessively loud and disregard the concept of privacy. When he senses that their behavior is intrusive, he tightens the antenna and switches it on.
Eric contends that he did not realize it was against the law to impede cell phone signals, considering it a "gray area." He expressed the belief that the restrictions were limited to blocking television or radio signals.
Even so, he lacks true remorse for what he has done.
In a conversation with NBC 10, he stated, "I feel that law enforcement is something I have taken to heart, and honestly, I am proud of that."
The use of signal jammers in this instance is prohibited for several reasons, including their capacity to disrupt cell phone communications in emergency situations and to hinder other vital signals, such as those used by police and two-way radios.
After learning that the device was illegal, Eric expressed his plan to get rid of the jammer he bought, which ABC News reported was priced at approximately $300.
Nevertheless, the primary issue is that Eric is not the only participant in this jamming activity.
Forbes indicates that people in the New Jersey and New York areas are also making use of these devices. Eric's narrative might prompt them to recall the legal implications associated with the use of such powerful equipment.