You can search for the same second-hand Apple mobile phone on multiple platforms according to your own needs, and then the comprehensive comparison price is probably the market price of second-hand Apple mobile phones.
You can go to the field and ask more merchants to find out the market price. The disadvantage is that the price may be generally higher without acquaintances, so it is better to have friends who know you.
Most merchants selling second-hand Apple mobile phones in WeChat circle of friends have physical stores, and the models updated every day will be clearly marked, so that the price can be closer to the market, so this method is more reliable.
IPhone is a smart phone developed by Apple, which is equipped with the iOS operating system developed by Apple.