<script type="text/javascript">// <![CDATA[
 if (screen.width <= 699) { document.location = "mobile.html"; }
// ]]></script>

“mobile.html” would be replaced with the location of wherever your mobile version resides. This technique could be adapted to load an alternate stylesheet as well.

For iPhones/iPods Specifically

<script type=”text/javascript” language=”javascript”>// <![CDATA[
if ((navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i))) { location.replace("http://url-to-send-them/iphone.html"); }
// ]]></script>

source(s)

• http://9to5mac.com/2011/11/08/heres-how-to-enable-panoramic-camera-mode-on-your-iphone-without-jailbreaking/
• http://9to5mac.com/2011/11/09/ios-5-hides-an-android-like-autocorrect-keyboard-bar-heres-how-to-enable-it/

This makes you realize, since apple can’t come up with a new iPhone 5. Solution, they just used the same exact phone, just upgraded the processor (from iPad2) and added a “new” (but existing free app). And called it a new Phone (add those marketing chu-chu crap about the speed). I hope there is a petition out there to enable Siri back to the old iPhone (3GS and 4).

Warning: This will result in your iPhone 4 baseband being upgraded to the latest version.

for Mac OS X:

1. Hit command+space (open spotlight)
2. Type in Terminal (select the one from the Applications/Utilities folder
3. Type “sudo nano /etc/hosts” (without quotes) and hit return.
4. Enter your password
5. Use the down arrow key to find the “gs.apple.com” entries. Once the cursor is in front, make sure you comment out the line(s) by entering “#” in front of the text. (to disable that line or comment it out)
6. Save the file by pressing control+O (then enter to accept).
7. Exit the nano editor by pressing control+X.
8. Now your done. Try restoring again your device.

for Windows:

1. Win+R (open “Run”)
2. Make sure your in “Administrator” mode or UAC disabled so you can edit your hosts file
3. type in “notepad c:\Windows\System32\drivers\etc\hosts” (without the quotes, this is if your windows is in drive “C:”).
4. Use the down arrow key to find the “gs.apple.com” entries. Once the cursor is in front, make sure you comment out the line(s) by entering “#” in front of the text. (to disable that line or comment it out)
5. Hit Save
6. Now your done. Try restoring again your device.

the dev-team really were quick to draw this time around. just after a few hours when iOS was released, we already have redsnow 9.5 which can “hacktivate” (or jailbreak) any iPhone3G or iPod Touch 2G, unfortunately no unlock yet folks. But I have a feeling we will “soon” have this (i think)

Download links for redsn0w 0.9.5b5-3 below:

• Mac OSX (x86)
• Windows

WARNING: For now, the redsn0w beta release supports only the iPhone3G and iPod Touch 2G at today’s 4.0. It’s still a beta, so you’ll need to let Cydia reorganize, reload, and update after using redsn0w.

Its fairly easy to use. I wont bother putting a tutorial in. If you know how to use a computer (Windows/OSX) you can use this.

reference URL: http://blog.iphone-dev.org

Some features worth mentioning:

• 32GB and 16GB storage (up from the current 16GB and 8GB models)
• $199 and $299 price points to be maintained
• 3.2-megapixel camera (up from the current 2-megapixel camera)
• Video-recording and editing capabilities
• Ability to send a picture & video via MMS
• Discontinuation of the metal band surrounding the edge of the device
• OLED screen
• 1.5 times the battery life of the current models
• Double the RAM and processing power
• Built-in FM transmitter
• Apple logo on back will glow
• Rubber-tread backing
• Sleeker design
• Built-in compass
• The camera, GPS, compass and Google map combined will identify photo and inform about photo locations
• Turn-by-turn directions

Source : http://www.macrumors.com/2009/02/12/leaked-photos-of-next-generation-iphone/

reference: www.businessweek.com