What's the signal of Apple's mobile phone in Nanjing Unicom?

Because Apple's mobile phone is a full netcom mobile phone and adapts to these network technologies, it has little to do with the network technologies of the three operators, but is related to the coverage and penetration of the network. If you are in a remote area, it is recommended to use mobile, because mobile coverage is high and there are signals everywhere. If you are in a city, you should choose Unicom, which has a good penetration and a signal in the office building.