Commercial Hot Spots
Tapping the name of the hot spot you want to join is generally all you have to do—if it's a home Wi-Fi network. Unfortunately, joining a commercialWi-Fi hot spot—one that requires a credit-card number (in a hotel room or airport, for example)—requires more than just connecting to it. You also have to sign into it, exactly as you'd do if you were using a laptop.
To do that, return to the Home screen and open Safari. You'll see the "Enter your payment information" screen, either immediately or as soon as you try to open a Web page of your choice.

Supply your credit-card information or (if you have a membership to this Wi-Fi chain, like Boingo or T-Mobile) your name and password. Tap Submit or Proceed, try not to contemplate the cost, and enjoy your surfing.
Tip
Mercifully, the iPhone 3.0 software memorizes your password. The next time you use this hotspot, you won't have to enter it again.
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