It is best to use a secured wireless network if you can from your iPhone when access the Internet. By doing so, you can save money on your data plan by sending and receiving less data over the phone network, and the Internet will likely be faster via wireless as well. So, it is win-win.
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Step 1: Tap the "Settings" app.
Step 2: Tap "Wi-Fi".
Step 3: Toggle the "Wi-Fi" slider on.
Step 4: Select a network from the list. If your network is not detected, ensure that you are within range and your network is correctly configured.
Step 5: Enter the network password. Press "Join". Check with the network administrator if you don't know the password.
Step 6: Check your connection. After entering the password, your iPhone will attempt to connect to the network. Open Safari to check if you can open a website.