Mở ứng dụng Settings. Chọn "Wi-Fi." Nhấn nút ⓘ cạnh tên mạng không dây. Tìm mục "IP Address".

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
This will display a list wireless networks. This will open the details for the wireless network you are connected to. This will display your iPhone's IP address, and will usually be towards the top of the list.