Do iPhones (or just a smart phones in general) send packets when they are fully shutdown? I have heard that they do, but I have not been able to verify such a claim. In an effort to investigate, I ARP Poisoned my own iPhone (legally on my own network) and monitored the packets via Wireshark on my computer, but once I shutdown the iPhone there were no more packets being sent or received. I am assuming that is because the ARP poisoning only works when the device is on the same network as you--whereas I would presume a shutdown iPhone disconnects from its current Wifi connection upon shutdown. Is that correct? Or is it truly not sending any packets? If they do send packets when they are shutdown then how would I go about sniffing those packets to see what it is all doing?