The iodé adblocker runs permanently on your device by default. One way to detect a tracker is to monitor Internet activity, by intercepting connections coming in and out of the phone. This is a method actually used by hackers and is known as a MITM (Man In The Middle) attack. The iodé blocker uses this principle to trace the network activity such as network packet exchanges and DNS requests. It analyzes internet connections on the DNS level, in order to decide which addresses to block and which to serve you. Imagine having a machine blocking unwanted calls from that person you don‘t want to talk to anymore. That‘s kind of how it works.