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Following are the secret codes for your i phone
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1) *3001#12345#* and tap Call. Enter Field Mode.Field mode reveals many
of the inner settings of your iPhone,
specifically up-to-date network and cell information.
2) *#06# Displays your IMEI. No need to tap Call.IMEI is the unique
identifier for your cell phone hardware.
Together with your SIM information it identifies you to the provider
network.
3) *777# and tap Call. Account balance for prepaid iPhone.
4) *225# and tap Call. Bill Balance. (Postpaid only)
5) *646# and tap Call. Check minutes. (Postpaid only)These three are
pretty self explanatory.
6) *#21# and tap Call. Setting interrogation for call forwards.Discover
the settings for your call forwarding.
You’ll see whether you have voice, data, fax, sms, sync, async, packet
access, and pad access call forwarding
enabled or disabled.
7) *#30# and tap Call. Calling line presentation check.This displays whether
you have enabled or disabled the presentation of the calling line,
presumably the number of the party placing the call.
*#76# and tap Call. Check whether the connected line presentation is
enabled or not.State whether the connected line presentation is enabled
or disabled. Presumably similar to the calling line presentation.
9) *#43# and tap Call. Determine if call waiting is enabled.Displays call
waiting status for voice, data, fax, sms,sync data, async data, packet access
and pad access. Each item is either enabled or disabled.
10) *#61# and tap Call. Check the number for unanswered calls.Show the number for
voice call forwarding when a call is unanswered. Also show the options for
data, fax, sms, sync, async, packet access and pad access.
11) *#62# and tap Call. Check the number for call forwarding if no service is
available.Just like the previous, except for no-service rather than no-answer
situations.
12) *#67# and tap Call. Check the number for call forwarding when the iPhone is
busy.And again, but for when the iPhone is busy.
13) *#33# and tap Call. Check for call control bars.Check all the usual suspects
(voice, data, fax, sms, etc) to see whether barring is enabled or disabled for
outgoing.

iPhone Dev Team has released an updated version of UltraSn0w 0.9, their software solution to unlock iPhone 3G and iPhone 3GS.
They believe that the new version "pretty much all of the various random issues that have been reported".
In the meanwhile, Geohot, the member of the iPhone Dev Team who had released his own software called purplera1n to jailbreak iPhone 3GS running iPhone OS 3.0 and couple of days back had releasedpurlesn0w to unlock iPhone 3GS has also released purlesn0w RC2 which fixes many issues.


iPhone Dev Team believe that the new version "pretty much all of the various random issues that have been reported":
• Works on both iPhone 3G and iPhone 3GS
• Works on hacktivated devices
• Works regardless of how you jailbroke your device
• Doesn’t patch any mach-o binary whatsoever. (Doesn’t require a separate patch as each new firmware comes out).
• Doesn’t install any additional daemon
• Has no race conditions, no popups about “Missing SIM”, no network issues
• Is almost 7000 times smaller than its nearest competition :)
• Is available now via Cydia. Source repo ishttp://repo666.ultrasn0w.com (that last “0” in ultrasn0w is a zero!)
Geohot has released purplesn0w RC2 which has fixed the following issues:
• Works on only iPhone 3GS
• 3G(the network speed) issues fixed
• Now only patches one file, CommCenter
• Leaves no traces on your baseband after it runs. Seriously
• Much more clean and reliable.
He has provided the following instructions to unlock iPhone 3GS:
• Be sure to have legit activated 3GS
• Disable 3G if you don't have it(like T-Mobile).
• Add apt.geohot.com to Cydia
• Install(or Update) com.geohot.purplesn0w
• Watch for success output in Cydia(actually do this step)
• Wait for signal, and enjoy your unlocked iPhone(no reboot required)
When Geohot had released his own software solution to unlock iPhone 3GS, he had claimed that his iPhone 3GS unlock solution is better than UltraSn0w. Dev Team have published details on their blog on why they don't agree with his claim to which Geohot has also responded on his blog.
So if you are planning to unlock your iPhone 3GS running iPhone OS 3.0 then you can try UltraSn0w (works on iPhone 3G as well) or purplesn0w to see which one works well. You can checkout our step-by-step guide to unlock iPhone 3G/iPhone 3GS running iPhone OS 3.0 using UltraSn0w.
Please don't forget to take a backup of your iPhone (refer to this post for more details) and also proceed with caution as it could void it's warranty.
Please tell us how it goes and which unlocking solution is better.



These are instructions step by step how to unlock Jailbreak and almost instantly any iPhone! No downgrading then updated! You can do the unlock from 1.1.2 or 1.1.3. It will also jailbreak and activate as well as install Installer.app for you!

ZiPhone performs all these functions:
- Unlock will work on 4.6 BL and 3.9 BL.
- Jailbreak will work on any OS version.
- Activation will work on any OS version, except for youtube on 1.0.X.
- iErase BL 3.9 Baseband
1-Download ZiPhone from: here (links rapidshare)
2-Double-click to extract ZiPhoneOSX-2.4.tbz on your desktop

3-Launch the ZiphoneOSX application
4-You must put your iPhone in recovery mode. (hold down Watch / Sleep/Wake for 3 seconds. A power cursor appears). Slide it to the right to power down the iPhone. Then keeping ONLY the Home button pressed, connect the iPhone to the dock. Keep the home button pressed until you see the iTunes logo and cable on the screen.
5-If you have a 3.9 or 4.6 BL iPhone you can now activate, jailbreak, and unlock! Just simply check the Activate, Jailbreak, and Unlock checkboxes. Then click the Start button.
6-The program will now load zibri.dat. Then it will search for the iPhone. Once found it will tell you to wait for 2 minutes and 30 seconds.
7-After this time your iPhone will reboot and it will be activated, jailbroken, and unlocked!
NOTE*: After completion its probably a good idea to install BSD Subsystem first then OpenSSH from Installer.app
Video how to unlock Iphone using Ziphone