Watch Dogs
49 Achievements
1,250
Communication Fail
Using non-lethal takedown, stop 10 civilians from calling to report you
10
How to unlock the Communication Fail achievement in Watch Dogs - Definitive Guide
To make a civilian NPC call in a report to the police you'll need to cause a bit of trouble which mainly consists of bringing your gun out in public and aiming/shooting at someone. During this, your wanted level bar will increase and at some point someone will call the police.
When a report is being called in, and red triangular icon will pop up on your screen. Locate the icon and it'll be over the civilian making the report. You'll now need to quickly run up to them before the red bar incases the icon and while unarmed, press . Doing so, Aiden will grab the phone and stop the call going through.
Repeat this method 9 more times to unlock the achievement.
This is very simple. At many times throughout the game you will commit crimes and if a citizen witnesses you committing one, they will call the police. You will hear their conversation reporting you to the police and you'll see a red warning triangle above there heads. Before they finish the call with the police, you need to stop them. You can do this by running up to them and hitting to end their call or use a Jam Coms from a distance.
I found the easiest way is to use the Jam Coms, make sure you have acquired this skill first then you can craft them as long as you have the supplies. This is the most useful item to avoid being chased all the time by the cops. Whenever you car jack a vehicle, if you notice the driver starting to call the police, just hit with the Jam Coms is equipped to stop the call. Do this 10 times for the trophy. You can also do this on Blume Affiliate citizens. When you hack one, they'll call and report the hack and a bounty will be placed upon you. Use your Jam Coms during that call. They'll have a purple icon.