iPhone iOS4 jailbroken.
Just visit this link from your phone and it’ll do the rest. Takes 5-10 minutes.
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And here’s a mirror in case the link above is bogged down and not working:
http://jailbreakme.modmyi.com/
And yes, jailbreaking is now 100% legal according to the U.S. Government. Though it may still void your warranty, it’s easily reversible. I jailbroke my phone just so I can tether it to my iPad instead of having to get the 3G iPad.
Huh. Getting Cydie on the phone should be pretty much it. There’s nothing after it. Try here for answers:
http://www.reddit.com/r/iphone/comments/cw6bs/new_iphone_4_jailbreak_is_out_right_now/
Or you can tweet the guy who released it who has apparently be super responsive.
The prime market are people who aren’t on AT&T looking to use an iPhone. It lets them unlock the carrier settings so they can use whomever they want.
The rest are people looking to drop a few limitations. So I got MyWI or whatever it’s called so I can create wifi networks with my phone to share my 3G connection, and another app that fools the phone into thinking it’s always on a wifi connetion so I can download > 10mb things or connect to facetime calls.
Useful apps you can get with a jailbroken phone:
http://www.reddit.com/r/iphone/comments/cxav6/post_your_favorite_cydia_apps_and_cydia_vs_rock/