How to Use an iPhone as a WiFi Hub for an iPadby Amanda Gronot
If you have an iPhone running iOS 4 or later, you can share your cellular Internet connection with other devices, such as an iPad. Essentially, your iPhone converts its cellular Internet connection into a Wi-Fi signal for your iPad to pick up. You must first activate this feature on your cellular account; then you can turn on the feature in your iPhone's settings. Once the feature is on, you can connect your iPad to the signal.
Call your cellular carrier or go to your account online to activate the hotspot feature. This may incur additional charges.
Tap "Settings" on your iPhone's home screen, then tap "General" and then tap "Network." Tap "Personal Hotspot."
Slide the toggle switch to "On." Choose to turn on Bluetooth or use only Wi-Fi and USB in the dialog box that appears. Tap the password bar to reset the password if you want to change it.
Tap "Settings" on your iPad's home screen. Tap "Wi-Fi." Tap the network with the name of your iPhone. Enter the password to connect. You will see "Personal Hotspot: 1 Connection" in blue at the top of your iPhone's screen.