Someone correct me if I am wrong, but aren't all Droid 4 locked to Verizon? Thankfully there is a way to bypass the "insert sim" screen
I can't remember the sequence exactly, but the trick is to touch each of the 4 corners of your screen in a clockwise manner, starting from the top left.
If it doesn't work Google for the right sequence.
Once you get pass that screen, skip whatever restore from backup prompts, switch on usb debug, connect usb, set to camera ptp and proceed with the rest of the guide!