How to Jailbreak iPhone 4, iPhone 3GS with iOS Version 4.0 Using JailbreakMe.com.
Warning: Jailbreak at your own risk. Please exercise caution and read the comments, as these jailbreak instructions are not guaranteed to work.
To jailbreak another version of the iPhone, visit the ultimate iPhone Jailbreak guide.
This tutorial contains instructions on jailbreaking your iPhone without the need for a computer. This is the easiest jailbreak there is for iOS 4 users.
Jailbreak iOS 4 on iPhone 4 & iPhone 3GS
- iPhone 4 or iPhone 3GS
- Firmware: 4.0 (check your version in Settings » General » About)
1. Open Safari on your iPhone and visit JailbreakMe.com.
2. Touch “Free” and then “Install.”
3. Wait patiently and, if all goes well, you will have a jailbroken iPhone.
Was your jailbreak successful? Please post questions and suggestions in the comments.