When your phone is connected to Wi-Fi, it will be temporarily assigned
an IP address so the network can communicate with your device and allow
your device to access the internet.
Open the Settings App.
Tap Wi-Fi.
On the right side, any Wi-Fi Network(s) within range will be listed.
The network you are connected to will have a blue checkmark to its left.
To the right of current network will be a lower case letter "i" in a circle.
Tap the "i" to get more information.
Your IP address and other relevant information will be shown on the screen.
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