How can I use iphone 3G as an Internet modem to laptop ?

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 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 out of its file-system lock-down, second-generation iPhone 3G 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 to its 3G data connection through to your laptop, so make sure you brush up on your iPhone 3G jailbreak protocol before jumping in to this iPhone 3G tethering guide.
Follow this tutorial to get your iPhone 3G tethered and playing nice with your laptop:

1. Jailbreak your iPhone 3G
2. Install 3Proxy and MobileTerminal
   1. Fire up the “Cydia” application that was installed during the iPhone 3G jailbreak
   2. Navigate to Install>All Packages
   3. Find and install MobileTerminal
   4. Find and install 3Proxy
   5. 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)
3. Create an ad-hoc WiFi network on your laptop laptop
   1. Name it something memorable – like “Tether-ific”
4. Lock your iPhone 3G on to the ad-hoc WiFi network you just created
   1. Settings>WiFi Networks
5. Find out your iPhone’s IP address
   1. Setting>WiFi Networks
   2. Tap on the little blue arrow to the right of the WiFi network you just joined – “Tether-ific,” in this case
   3. Write down the iPhone IP address
6. Fire up MobileTerminal on your iPhone 3G
   1. Execute the proxy program
      1. Type in “socks” and hit enter
      2. You won’t get any confirmation that the SOCKS server is up and running, but it is
      3. Hit the “Hom” button to return to homescreen
         1. Remember to quit the MobileTerminal application by opening it later and holding down the “Home” button and forcing it to quit
7. Start up your iPhone’s Safari browser and open a web page
   1. 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
   2. This step takes a little while, so be patient
8. Configure Firefox to use your iPhone proxy
   1. Preferences>Advanced>Network>Setting
   2. Find the “SOCKS Host” field and enter the IP address you wrote down earlier
   3. Set port to”1080″
   4. Go to Firefox’s address bar and type in “about:config”
      1. Hit Enter
   5. Find the “Filter” field and type in “socks”
      1. Hit Enter
   6. Find the entry that looks like “network.proxy.socks_remote_dns”
      1. Double click
   7. Change value to “true”
9. You’re done, get to surfing the web through your new iPhone 3G 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


Others System of 3G Internet

Step One
Navigate to the Wireless and Network settings menu. Some phones have an app in the apps menu for creating a wireless hotspot.
Step Two
Click Tethering and Portable Hotspot or similar option.
Step Three
Turn Portable WiFi hotspot or similar on and set a network name and/or password.

Step Four
Connect to the network on your laptop via the available wireless networks in the bottom right hand corner (Windows).

It is also possible to tether/WiFi hotspot with a Blackberry, iPhone and Windows Phone so look out for upcoming articles on how to tehter on each of these.

Instructions

1. • 1
     Download and install a tethering application on your 3G smartphone. Tethering applications allow you to use your 3G connection on the laptop to access the Internet. Using your smartphone's application store, search for "Tethering" or "Tether." Select one of the programs for the search results, and download the application.
     
   • 2
     Download and install the other required tethering software on your personal computer. Most tethering applications require a second program to be downloaded onto the computer. Using instructions from the tethering app, access the download page from your computer. Click on "Download" to download the setup file. Double-click on the file to install the application on the computer.
     
   • 3
     Connect the 3G-capable smartphone to the computer using the provided data cable and an available USB port. Start the tethering application on the smartphone. Within the app's settings, click "Start," "Enable" or something similar to turn on the tethering capabilities of your smartphone. If required, start the tethering application on your computer, as well, to begin using your 3G connection to access the Internet.
     
     
     Thank you
     Asraful