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The only way that you can have the wireless through AT&T is by using the iPhone as a mobile hotspot.
Set up Personal Hotspot
Follow these steps to set up your Personal Hotspot:
After you set up Personal Hotspot, you can go to Settings > Personal Hotspot to turn it on or off and change your password.
If you don't see the option for Personal Hotspot, ask your carrier if you can use Personal Hotspot with your plan.
If you're using iOS 8, you can useInstant Hotspot to share your cellular data connection without having to turn on Personal Hotspot first.