PilferShush Jammer APK

Version 4.2.0 - cityfreqs.com.pilfershushjammer
Last updated: 2020-03-29

Block unwanted use of microphone by tracking apps

PilferShush Jammer apk

APP Information

Download Version 4.2.0 (32)
Apk Size2.40 MB
App DeveloperCityfreqs
Malware CheckTRUSTED
Install on Android4.3.x and up
App Packagecityfreqs.com.pilfershushjammer.apk
Website https://github.com/kaputnikGo/PilferShushJammer

Download PilferShush Jammer 4.2.0 APK

App Description

PilferShush Jammer is cityfreqs,pilfershushjammer,tools,pilfershush,jammer, content rating is Everyone (PEGI-3). This app is rated 5 by 1 users who are using this app. To know more about the company/developer, visit Cityfreqs website who developed it. cityfreqs.com.pilfershushjammer.apk apps can be downloaded and installed on Android 4.3.x and higher Android devices. The Latest Version of 4.2.0 Available for download. Download the app using your favorite browser and click Install to install the application. Please note that we provide both basic and pure APK files and faster download speeds than APK Mirror. This app APK has been downloaded 89+ times on store. You can also download cityfreqs.com.pilfershushjammer APK and run it with the popular Android Emulators.

PilferShush Jammer blocks other apps attempting to utilise the microphone without your knowledge. Some apps use hidden processes to record tracking audio in the background that is either generated by nearby beacons, television commercials, streamed music services or websites. This tracking audio is transmitted between 18 kHz and 22 kHz (near ultra high frequency) which is beyond the range of typical human hearing but within the recording range of a typical Android phone.

To block unwanted use of the microphone by hidden app processes, PilferShush Jammer requests use of the hardware microphone from the Android system and holds it. This technique locks up the microphone from any other apps attempting to gain access to it. This technique has been tested only on user apps, not system apps. The Android system should halt PilferShush Jammer from blocking the microphone whenever a phone call is received or made.

When the jamming technique is running and the microphone is locked up, PilferShush Jammer posts a notification to keep the user informed that it is running. Tests have shown that it uses 0% CPU, 0% network and 43.6mb RAM when running for over an hour.

This is an experimental app made as part of research into audio counter-surveillance methods within the Android and IoT world.

It requires RECORD_AUDIO permission so that it may access and lock up the microphone.

It does NOT record or listen to any audio. 
It does NOT connect to the internet.

Version 2.0 Active Jammer addition:

Tones can be emitted with a carrier frequency and a drift limit with rate all constrained to NUHF of 18 kHz to 24 kHz depending on the device capabilities. For instance 20000 Hz carrier, drift limit 1000 Hz and rate slow - will output random frequency between 19 kHz and 21 kHz approximately every second.

Version 3.0 Jammers run as a service:

Both the active and passive jammers now run as a (foreground) service that should accurately indicate whether they are running or not. This is dependent on both the Android OS (power management) and any App Managers that may destroy running services. 

As this app seeks to block microphone use it is important to NOT dismiss or hide the notification otherwise you may forget it is running.

Also includes a scanner to check user installed apps for NUHF and Audio Content Recognition (ACR) SDKs as well as any services or receivers.

Version 4.0 Redesign
Major overhaul of the design to make information clearer and to simplify typical uses of the app

The next release will investigate removing the audible artifacts (popping and clicking) present during the active jamming tones.

White noise output may not be very effective at blocking and is a somewhat annoying sound. 

The speaker output may not have enough amplitude to block unwanted NUHF signals - testing will determine.

Source code is available here: https://github.com/kaputnikGo/PilferShushJammer
Research and Project webpage : https://www.cityfreqs.com.au/pilfer.php

App ChangeLog

  • - bugfix for AUDIO_RECORD permission deny handling
  • - clarity of rationale for permission request

App Screens

PilferShush Jammer App Screen 1PilferShush Jammer App Screen 2PilferShush Jammer App Screen 3

Reviews From google play store

Why does passive keep shutting off as soon as i turn it on. I will give a true star rating later, but I need to fully understand how this works and if it's doing what I hope I think it's supposed to do. Please help me with another issue,. Someone is targeting me with ultrasonic and or infrasonic frequency (i do NOT know what frequency) how can I get to stop, i don't know who they are. Only that they are lowlife with nothing better to do. Can't catch them.

This is really a super amazing app, thank you so much for the developer. I'd love to give more stars, but someone who hacking my phone sometimes successfully remotely turn off this app. Would you please fix this? Thank you!

This app is great for privacy but can effect your pets. It states it's a research app and it's very important research that's being done. I'm waiting to find out a little more about the project as a whole because I believe this could be extremely important research. It appears to work really well so far, if nothing else it will give you a list of bad apps that use NUHF to listen in on group conversations. My only concern is the effect it could potentially pose to animals but they'll tell you.

Does what it says on the tin and more. You can choose white noise or tone generation; passively engage the mic, preventing other apps or processes from accessing it; and look for malicious apps trying to surveil you. The only permission it asks for is to access the microphone. So far, so excellent.

if your peeps have made you feel as though you are actually cracking up because YOU -- KNOW-- that things have been altered in your phone ... This is the app you need to once and for all show all of them in writing or rather typeprint.. every single listener and remote shared to local devices like your camera. yep your camera

Junk doesn't work passive scanning keep turning off just junk all the way around.check all apps none in use.

Thank works well but got disabled need adviser

it was great off and pm but stopped working

Seems to just make s lot of weird noise.

very informative... so many apps need to get a life and get out of mine.


requires following permissions on your android device.

Allows access to the list of accounts in the Accounts Service.

record audio
Allows the app to record audio with the microphone. This permission allows the app to record audio at any time without your confirmation.

Older Versions

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