I have a 3G iphone 2.0.2, I did jailbreak it using Winpwd 2.5. Everything went fine, except that I don't have service anymore. I do have at&t SIM and it shows no service.
Did you choose to "activate" the phone when winpwn asked? If you did, thats why. If you are using AT&T then you DO NOT want winpwn to activate the phone, let itunes do the activating.
Also do not choose activate YouTube if you are on ATT or another contract carrier.
I havent left my house yet, but I seem to have a more stable signal since redoing my pwn with WInpwn 2.5.
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iPhone, the Swiss Army knife of the 21st Century.
Yes, I choose not approved carrier because I'll be traveling out-of-country soon, so I need to use the iphone with at&t and then switch to different carrier without being charged for roaming.