Can Apple track an iPhone on wifi? without gps or sim card?

No

Find My iPhone requires iOS 5. The OP claims to have an iPhone 3G, which cannot run iOS 5. So I suspect this is not an option.

OK, I understand.

Probably the best thing you can do is report the situation and iPhone's serial number to the authorities.

There's no way for you to track it!

Report the device missing to the authorities.

No. The only way that AT&T could track a phone, if they would, would be if it was connected to their network. Without a SIM card, it is not connected to their network.

Message was edited by: ChrisJ4203

I wonder why you are asking this question ...

ChrisJ4203 sounds generally correct, but I believe your iPhone could still make an emergency call (9-1-1 in the U.S.) without a SIM card. So maybe we're getting into trivia, but I have to wonder what your real purpose is in asking such a question.

Apple does not track anything.

Good catch.

That is correct

Thank you.

Apple cannot track your iphone at all.

ONLY you can track it and ONLY if you have set up find my iphone on the iphone itself and it is on.