I've got an iphone with no SIM which will not go into DFU mode for anything. The apple logo keeps coming up. I've tried multiple times to get it into DFU mode but I always either end up in regular recovery mode or just rebooting the phone.

Is this because of it not having a SIM card? Is there a software way to put the phone in DFU mode? Its on 2.0 and Itunes recognizes it but doesn't activate because no SIM.

I thought about popping my 3g sim into it...but don't want to **** my 3g up. Ideas??