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As I mentioned in the first chapter, your device will remember networks you've previously connected to and automatically reconnect to them. This is a convenience so you don't have to constantly go through a series of menus to connect to a network you've already been on. If the Wi-Fi network has a unique name, this is just fine, but if you're guilty of leaving your Wi-Fi router's name at its default setting, for example, you can be almost certain to find multiple Wi-Fi networks with the name Linksys or even Wireless, your iPhone won't be able to tell the difference between one Wi-Fi network named Wireless and another and will happily connect to any router with that name whenever you are within range of one.
In some cases, that will be okay and you'll just end up leeching off someone else's network with the same name. But occasionally, your iPhone or iPod touch will connect to an identically named Wi-Fi network that has other settings, which might not let you connect to the Internet even though it allowed you to connect to the Wi-Fi network itself. In those cases, it can be confusing when you see a strong Wi-Fi connection indicated on your device while being completely unable to open a web page, check your email or connect to the Internet in anyway. If you run into this problem, open your Wi-Fi Settings and check which network you're connected to. You might recognize a network name identical to one you normally connect to at home or elsewhere.
Now if one is available, try selecting a different network and getting online again. Another option is to tap the blue arrow next the network that's giving you problems and then tap Forget this Network and then tap Forget. That makes your iPhone or iPod touch stop automatically connecting to networks with this name. So, if you're used to connecting to a Wi-Fi network named Wireless while you're at home and you run into another network named Wireless while on a trip that your iPhone keeps connecting to, you can tap Forget this Network. You'll have to reconnect to your own network again once get home, but at least your phone won't keep automatically connecting to the wrong one while you're on your trip.
Another scenario, in which you might find it useful to forget a network, is if you've ever paid for Wi-Fi in a public place. For example, in some businesses like hotels and coffee shops, you have to first connect to a Wi-Fi network which then redirects you to a page where you have to enter your credit card number to purchase access time. If you do this one time in a hotel, the next time you're in the same hotel or even in another property from the same chain, that has the same Wi-Fi network name, your iPhone and iPod touch will automatically connect to that network and you'll be unable to access the Internet without paying again. But if you're on an iPhone and just want to use the cellular network to quickly check your email, go into your Wi-Fi Settings and tap Forget this Network to make your phone stop trying to connect to it or alternately, turn Wi-Fi off which will make your Internet connection default to the cellular network.
Another behavior you might find annoying when you're out and about with your iPhone or iPod touch is that it might always give you a list of nearby Wi-Fi networks any time you try to do something that requires an Internet connection. Now on an iPod touch, that might not be so bad, since Wi-Fi is the only way for you to get online, but on an iPhone, especially when you're in a major city where there are dozens of Wi-Fi signals everywhere and most of them are locked or unavailable, having your iPhone ask you to join one of these networks each time you try to do something Internet related, can get really annoying really quickly. In those cases, go into your Wi-Fi Settings and make sure Ask to Join Networks is off. That way, your iPhone or iPod touch will still connect to any networks it recognizes, but it won't keep bugging you to join other networks it detects.
So, those are just some additional things to know and understand about your Wi-Fi Settings.
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