Another Android app with a high user rating is Scanner 911, developed by XYWARE. Live audio from thousands of police, fire, EMS, and aviation frequencies across the country is available. You can search stations by town or city, or you can input your location and sort scanners by distance, so you can listen to feeds right in your neighborhood.
Scanner 911 allows you to play a station in the background while using other apps, and adjust the sound with equalizer and amplifier effects to ensure you’re getting the listening experience you want. Lock-screen controls allow you to use the app without opening your phone. There’s also a sleep timer if you’re using the gentle sounds of air traffic controllers to help you fall asleep.
The app also includes a list of “10-codes” used by first responders so you can decipher what they’re saying to each other over the radio, which is useful for anyone who doesn’t know what “10-four” means off-hand. Scanner 911 doesn’t include a paid Pro version, so you get all these features without having to pay extra. However, you’ll have to deal with ads. The app also hasn’t been updated (at the time of this writing) since June 2021, so any bugs that have popped up since then have yet to be patched.