iPhone Screenshots


"I've been in law enforcement for 20 years and I have found a lot of apps that helped me do my job. However this one surpasses them all. Best law enforcement app yet." - NC Police Officer

"Top 15 Mobile & Tablet Police Apps" - CriminalJusticePursuit

10-21 (radio code for "make a phone call") is a Police App for making free* calls to citizens that GET ANSWERED. Calls are made from local (not blocked) numbers without revealing your personal number. Stop getting sent to voicemail!

For example, if you call a citizen in Miami area code (305), they will receive an incoming call from a local (305) number, regardless of where you are. They are more likely to answer that call on your first try.

If the citizen calls back, rather than bugging you off-duty, they will be prompted to "Press 1 to Request a Call Back" (via Push Notification) or "Press 0 to Reach a Dispatcher" (connects to a non-emergency number that you provide).

When citizens request a call back, you receive a Push Notification on your phone rather than a phone call. At your convenience, simply tap the notification to initiate a call back out to the citizen.

*Calls are made over a VoIP data connection and do not use your cellular minutes. While the data used is minimal, data usage fees from your provider may apply.

What's New

Version 1.16.1

Minor Bug Fixes

Ratings and Reviews

4.5 out of 5
48 Ratings
48 Ratings
Trooper_6 ,

Great app with great intention.

I did love the app. Worked great when I had data service, however had to stop using it. We are on a 2gb plan for 3 people in my family and unfortunately the app used enough data to get my wife’s attention. Yes I did use it for work related purposes, however I’m the one paying the cell phone bill. If the app used my normal cell service which is 1. Unlimited and 2. Normally still available in low data service areas....then I would still be using it today. Love the idea behind it, but can’t use it.

Laterial ,

Great App

I’ve been using this app for three years now, and I’m surprised by the number of people who aren’t able to sign up or experience poor call quality. My agency only just transitioned to .gov email addresses last year, but I was able to sign up just down three years ago. If I recall correctly, I was able to upload a copy of my commission to verify my Identity. Several of my coworkers also use this app with no problems.

kamikaze2899 ,

Great idea

The idea behind this app is awesome. It save me from having to drive to the station to make call backs. Or rely on dispatch. I've blocked my number before, but no one answers blocked numbers anymore. I'd give 5 stars except for the quality of connection. Even with full LTE service, or connected to wifi. Voice quality is distorted and cuts out frequently. Much like a very bad cell phone connection. Most of my beat partners have deleted the app because of this. Fix it, and it's gold!


Callyo 2009 Corp.
13.3 MB
Requires iOS 9.1 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2015 Callyo 2009 Corp.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like