If you're a new iPhone owner, one of the first things you'll want to learn how to do is connect your iPhone to a wireless network. That's because there are certain times when your cellular data connection just won't cut it, even if you're lucky enough to have an unlimited data plan. Using Facetime, downloading content from iTunes, and even surfing the web can be painfully slow without a wi-fi connection.
By default, your iPhone automatically connects to known wi-fi networks. (To stop an iPhone from automatically connecting, you can tell your iPhone to forget a wi-fi network.) But what happens if you take your iPhone to a new location? You'll need to manually connect your iPhone to a wi-fi network.
When you connect an iPhone to a wi-fi network, the iPhone remembers that network and will automatically attempt to connect to it in the future. This is a great feature for wi-fi networks you trust and use frequently. But mistakes happen. If you connect to the wrong network at a coffee shop, your iPhone will automatically attempt to join that network every time you visit the coffee shop in the future. And if the password for a known network changes, your iPhone might have trouble connecting to it.
If you own an AirPort base station, you can use the Timed Access feature to control the days and times when users access the Internet. This could come in handy in a variety of situations. For example, if you own a cafe and provide free wi-fi access, you can configure the AirPort to block all access to the Internet when your business is closed. And if you have children, you can set time limits for specific devices in your home.
Just like in Mac OS X, you can change the DNS servers on your iPhone. This can significantly speed up Safari and other iPhone apps that use the Internet. For a general introduction to DNS, and to learn why you would want to change the DNS servers on your iPhone, see How to Change Your Mac's DNS Servers.