Fight the Three Kingdoms with Your Mobile Phone

Zhang Shao accidentally traveled to the Three Kingdoms because he scanned a QR code with his mobile phone. The place we passed through was the Coiling Snake Valley where the Vine Armor Soldiers were about to be set on fire. Surrounded by the Vine Armor Soldiers who were facing each other with swords, there were Shu soldiers on the top of the mountain who were about to set fire to them. At this time, the mobile phone in his arms rang. What kind of signal could actually reach the Three Kingdoms? Zhang Shao answered the phone in full view of everyone.