Wifi Jammer is a device that blocks WIFI signal transmission, usually used in some private places. Sometimes people use it as a prank device.

Is there a way to detect a WiFi jammer?
The best way to confirm someone is jamming is to use something called a spectrum analyzer. Wireless frequency spectrum analyzers are commonly used measure signals and interference.

Can you detect a Signal jammer?
While apps do exist that claim to detect signal jammers, they are largely unproven, and require a working signal to function. Without highly advanced, military-level technology at hand, it is virtually impossible for the average consumer to definitively detect a cell phone jammer.

How to Disable Signal Jammer Points？
Step 1
Walk away from the jammer point as far as possible. Most jammer systems can reach cell phones up to 30 feet. Drive or walk away from the point to receive and make phone calls.

Step 2
Purchase a quad band cell phone. These types of phones have multiple frequencies, which give you a better reception. Since most jammers use one frequency, you can use the other frequencies on your phone.
Step 3
Use a Voice Over Internet Protocol (VoIP) service that bypasses radio frequencies. One example is Skype, which is compatible with many cell phones.

Step 4
Purchase a data plan from your wireless company. Consider the different types such as 3G, 4G or EVDO, which use different frequencies.