I have 3.0.1 iphone 3G -- if I got to setting, then reset on the iphone and select: "Erase all content & settings" -- Will this re-lock my device? Will this remove my jailbreak?

Thank you!

I'm not an expert, but I did this on my unlocked/jailbroken 2G 3.0 because I wanted to give it to my dad as a gift. I left it to run overnight, woke up the next morning to a non-working iphone. I had to restore it in DFU mode and now it's locked again. I'm not sure what went wrong, but I would be cautious, unless someone can give you a firm answer.

It will securely remove all data but in most cases leave you with an iPhone in recovery mode. You'll have to restore the firmware - unlock will be gone on a 3G. Just make sure to restore to 3.0.0 or 3.0.1 then and NOT 3.1. You can jailbreak/unlock the iPhone then.

No problem on a 2G either

NEVER try this on a hacktivated 3GS at fw 3.0/3.01, you'll be stuck cause it only allows you to restore to 3.1!!!

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iPhone 3GS factory unlocked (3.1.2; Blackra1n, Cydia, OpenSSH, custom 3.0 ipcc file (no sig), tethering hack by Dev team, 32 GB)
iPhone 3G (3.0.1; Redsn0w 0.8, Cydia, OpenSSH) 16 GB

hey i had the same problem, i cliked erase all content when my iphone was unloked n now it only shows the apple logo, how do i restore it in DFU mode?
i really need help..

lol i just did this early and it f*ck up my phone. what you do is put it in DFU then open itunes and restore the firmware.

google how to put iphone in dfu.

what i did was held home and power at the same time. when the phone turns on i let go of power but keep holding on to hold. it should then show the icon connect to itunes