Best cell phone jammer EVER! I purchased this one to replace the one I already had (different brand). It quickly filled up with blocked numbers and I couldn't add anymore. It was ineffective at blocking 'out of area,' private, and 'unavailable' calls. Also, the phone would have to ring once before the call was blocked.
Review E10 Military Powerful Mobile Phone GPS Blocking Device
The interference effect is very good, and you don’t need to worry about it after you turn it on. There is an independent system, cheating records can be checked, even when the machine is turned on and off, very satisfied.