I got an Android Dev Phone so that we can test on it and build for it. My hope/thought was that I could use the SIM card from my iPhone as needed for testing, and use it as a WiFi device most of the time. After some initial hiccups, that does seem to be the case.
I had to add an APN as outlined here, then I was able to connect a Google account and get the phone working and set up WiFi. After that, I powered it down, removed the SIM and powered the phone back on. It shows a “No SIM Card” message, but everything – including WiFi access – still seems to work without the SIM card (now that the phone has been activated).