Question: I own the iPod touch but am having difficulty getting a wifi signal. How do I get around this?
Answer: The iPod touch gives you wireless access to the web, but only if you're in range of a wifi access point.
From Apple's web site: "iPod touch finds wireless networks and connects you to the Internet". That can be a little misleading to some people, especially since not everyone knows that most wireless networks only have a range of a few hundred yards.
Not all wifi networks allow free Internet access either. Many wifi centers like Starbucks or McDonald's charge you 2 or 3 bucks for the connectivity, which can add up quickly!
Assuming you have a wifi network at home, or are near a wifi hotspot, go to Settings and then Wi-Fi on your iPod touch.
Choose your Network, and enter a Password if prompted, and you should be connected to the internet. Note: Make sure the password you enter is the password for the wifi network and not the password for your computer.
If you don't see a network in the list of networks, then you might not be in range of any wifi access points.
If you're trying to connect to a cafe wifi like Peet's Coffee, or a hotel wifi network like The Hilton, then you'll usually need to agree to their Terms & Conditions before they'll let you access the internet or check email.
Open Safari and try to visit a web site like google.com and you'll see their terms and conditions page. Accept the terms (and pay any usage fees if applicable) and you should be able to get online.
If you are having issues connecting to a Wi-Fi hotspot, like at an airport or coffee shop, try renewing your DHCP lease.
1. Tap Settings >> Wi-Fi Networks, then tap More Info () next to the network.
2. In the DHCP panel, select the Renew Lease button.
Sometimes it's possible to resolve itouch/iphone network issues by removing the network connection and letting the device recognize the network from scratch.
Follow the same steps above for opening network settings, but click "Forget Network" to delete the connection.
Wait for your iTouch to disconnect and then reconnect.
UPDATED: Check out the first comment on this post that discusses DNS settings for getting your iTouch working using OpenDNS (and thanks a million to the person who posted it - you've helped thousands of readers get their iTouch connected!)
Here are a few other things to try (taken from Apple's support page):