Not sure what to do...

I just bought an iPhone4 and got it setup. My old SIM is deactivated in my old 3g. I jailbroke and updated my baseband to 6.15.00 (this is all for my 3g). Now in using Cydia, I don't have any Wifi or internet connection and so I can't get the unlocking source added and downloaded. I used Redsnow for everything and have 4.1.2 installed. I have no clue what to do next as I've never done this before!

I've read I can use a SIM that is currently activated but only have the one for my iPhone4 which will not fit.

Thanks for any help!!

 

Thanks for the reply!
So I do need a SIM card? I will look into the micro sim adapters then.
Also, once I use it in the 3g and download the program from Cydia, then will my Wifi start working once the phone is unlocked?

 

Yeah, my IP4 has Wifi, and I just tried resetting the network settings on my 3g with no luck. It recognizes the one and only network that is in range, the same one my IP4 recognizes and connects to. When I type in the network key, it tells me that it is unable to connect. I'm going to check the firewall settings but I doubt they're what's causing the problem as all other smart phones and computers in the house aren't having problems.