Recently I got new apple Iphone 3G bought from UK from O2 network and its carrier locked as most of Iphones in the world. The crazy thing is I lost its sim tray which is used to insert the sim card in to the phone, noobs here is a screen shot 
So I searched it on ebay to buy it ASAP. And found one for $7 plus free shipping and bought it. After playing up with the Iphone (it had software version 2.2) and I decided to update the software version to the newest OS 3.0 and done updating with Itunes. The next steps are to JailBreak it. Jailbreaking means it gives access to install thirt party apps like video reorders and other free aps.
JailBreaking instructions-
I followed these instructions you can follow it too- www.RuchiraBlog.com/unlockiphone
Unlock Instructions- Unlocking needs you to be in a WiFi area on normal method, this sucks because some of users doesn’t have Wifi on their area or home including me. or their WiFi is not working properly might be a hardware failure. SO this is most valuable part on this blog post I found a great software which is mostly not very famous in this category of unlocking iphones but its secure. I followed these steps.-
- Downloaded this great freeware! Download it here
- Connected
iPhone 3G with OS 3.0 Jailbreaked to computer - “Make sure your phone is connected to computer and run the Unlock3G_3.0 batch file and follow the onscreen instructions. (T-mobile users turn off 3G in iPhone setting before applying Ultrasn0w)”
- Rebooted phone once and if your EDGE or 3G is not working yet then reset network settings once in setting option.
So the Iphone 3G OS 3.0 is unlocked! Make sure to not install the new beta software updates such as 3.1 and 3.1 beta it will remove your unlock and you will lock it again and no secure options yet to unlock that versions.
Next Step- Enjoy your Iphone 3G
Iphone, lock and unlock, over and over.
Interesting info for the do-it-yourself experts! If anyone is looking to save some steps, I have some info on purchasing an Apple iPhone 3GS that is already Unlocked and Jailbroken at http://www.squidoo.com/Apple-iPhone-3GS-Unlocked-...