When you connect to the Internet on your iPhone using a Wi-Fi network instead of the 3G connection, you save battery life and experience faster network speeds. If you are having trouble getting online using a Wi-Fi network, check and adjust the network's advanced settings. Most Wi-Fi networks use the Dynamic Host Configuration Protocol (DHCP), which can be enabled through the Settings app.
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Tap "Settings" on the iPhone home screen.
Move the slider at the top of the screen to the "ON" position if Wi-Fi is not already enabled. A list of nearby Wi-Fi networks appear on the screen beneath "Choose a network."
Tap on the blue arrow icon next to the name of the Wi-Fi network you want to use to connect to the Internet and enter a password if prompted.
Tap the "DHCP" button underneath IP Address to enable the DHCP service.
Scroll down to the bottom of the screen and tap "Renew Lease" to automatically obtain a new IP address and use it to connect to the Wi-Fi network.