Drones usually have two connection methods. One is that the plane acts as a router, sends out wifi signals, and then connects with the mobile phone.
One is to connect directly with the plane by remote control. First, turn on the network device or function of the drone, and then use the mobile phone to find the WIFI network name of the drone and connect it like WIFI. Limited by the performance of mobile phone antenna, the distance between wifi and UAV should be about several hundred meters.