how to Use your iPhone 3G S as a wireless modem

Tether your iPhone 3G S to your laptop - Use your iPhone 3G S as a wireless modem
The iPhone tethering solution (”tethering” is a method that allows your laptop to use your mobile phone’s wireless data connection to surf the web, check email, etc.) that allowed first-generation iPhone owners to hop on the information superhighway at EDGE speeds wasn’t exactly what you would call preferred method for getting web access on-the-go. But, EDGE data speeds were enough for short-stints of web-surfing and email checking - when you absolutely need an internet-fix with no landline or WiFi hotspot in sight.With the iPhone 3G S launched in over 22 countries, mobile warriors the world over are cruising along at UMTS/HSPA speeds with abandon. And, now that the iPhone Dev Team has busted the iPhone 3G S out of its file-system lock-down, second-generation iPhone 3G S owners can now tether that delicious 3G data connection to their data-hungry laptops. Forget EDGE, 3G data is how you want to be perusing the intertubes, regardless of whether you’re using an iPhone or laptop.
You’ll need to jailbreak your iPhone 3G S to its 3G data connection through to your laptop, so make sure you brush up on your iPhone 3G S jailbreak protocol before jumping in to this iPhone 3G S tethering guide.
Follow this tutorial to get your iPhone 3G S tethered and playing nice with your laptop:


Jailbreak your iPhone 3G SInstall 3Proxy and MobileTerminal
Fire up the “Cydia” application that was installed during the iPhone 3G S jailbreak Navigate to Install>All Packages Find and install MobileTerminal Find and install 3Proxy
Hit the “Home” button to verify that MobileTerminal is now installed on the homescreen (3Proxy isn’t a GUI app, so you won’t see an application icon)
Create an ad-hoc WiFi network on your laptop laptop
Name it something memorable - like “Tether-ific”
Lock your iPhone 3G S on to the ad-hoc WiFi network you just created
Settings>WiFi Networks
Find out your iPhone’s IP address
Setting>WiFi Networks Tap on the little blue arrow to the right of the WiFi network you just joined - “Tether-ific,” in this case
Write down the iPhone IP address
Fire up MobileTerminal on your iPhone 3G S
Execute the proxy program
Type in “socks” and hit enter
You won’t get any confirmation that the SOCKS server is up and running, but it is
Hit the “Hom” button to return to homescreen
Remember to quit the MobileTerminal application by opening it later and holding down the “Home” button and forcing it to quit
Start up your iPhone’s Safari browser and open a web page
Wait for your iPhone’s Safari browser to realize that it can’t use the ad-hoc WiFi network (because it leads nowhere, for now) and then switch to using the 3G data connection
This step takes a little while, so be patient
Configure Firefox to use your iPhone proxy
Preferences>Advanced>Network>Setting Find the “SOCKS Host” field and enter the IP address you wrote down earlier Set port to”1080? Go to Firefox’s address bar and type in “about:config”
Hit Enter
Find the “Filter” field and type in “socks”
Hit Enter
Find the entry that looks like “network.proxy.socks_remote_dns”
Double click
Change value to “true”
You’re done, get to surfing the web through your new iPhone 3G S tether!
Remember to quit MobileTerminal when you’re done surfing at 3G speeds. Start up MobileTerminal again and hold down the “Home” button until the application force-quits
   

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