Cell phone signal jammers generally cannot block signals through ordinary walls. Walls are often made of insulating materials such as brick, concrete, or wood, which do not shield wireless signals. Therefore, ordinary walls cannot effectively block the transmission of mobile phone signals.
However, some special building structures or materials may have a certain shielding effect. For example, some metal firewalls, lead shielded rooms or special electromagnetic shielding materials can prevent the spread of wireless signals to a certain extent. These facilities are typically used in specific scenarios such as laboratories, military installations, or security-sensitive environments.
In general, ordinary walls cannot effectively block mobile phone signals. If you need to block cell phone signals, consider using specially designed cell phone jammer devices that interfere with cell phone signal transmissions by emitting signals at specific frequencies. However, the use of signal blockers requires compliance with local laws and regulations and must be used with caution to avoid interference with emergency communications or other legitimate communications.