Connect your i Phone 4 or i Phone 3GS to your computer via USB cable and restore i OS 4.2.1. Follow the onscreen instructions to put i Phone into DFU mode.Green Pois0n will start Jailbreaking your i Phone 4, 3GS i OS 4.2.1 untethered.

Once done, Greenpois0n will show the Complete button and there’ll be a flood of commands running on your i Phone screen :).

You’ve jailbroken your i Phone 4 or 3GS on i OS 4.2.1.

Greenpois0n untethered jailbreak does NOT require SHSH blobs for i OS 4.2b3.

If you’re already running i OS 4.2.1, skip to the next step (Make sure you read the imporant part above).

This often helps if you get emails on your computer/PC but not on your phone.

If you're having other issues with your phone/device, visit our Troubleshooting Assistant.I recently lost my iphone 4, and my Sister said I could have her Sprint phone. Not sure what the term is to make sure it's not still registered to their account.I was just wondering if I could put this phone onto my existing acct without any hassle from Verizon. Our Verizon coverage map may show why you're having trouble with device setup/activation, media transfers, apps, data connections, email, messaging, and placing/receiving calls.If you're having other issues with your phone or device, visit our Troubleshooting Assistant.If you can't remember your Gmail user name/password or your account has been locked, this info will help you.I was texting and my screen slowly dimmed and then wouldn't come back on. I just got this 2 days ago Is there a way that you can override the passcode put on the Settings/General/Restrictions passcode?