BB doesn't match Wirefly
I had called Best Buy before, and the lady said they don't match WireFly, but do match other actual stores like RadioShack and Walmart, etc.
I didn't know about Wirefly and those certain conditions, or of the complaints against them. Maybe sticking with BB is the way to go ... peace of mind, while still giving me the 30 days to test out the Nexus S 4G to see if I wanna keep it or return and wait for something else potentially down the line. So far, so good, though, with the phone outside of WiFi not obtaining a strong connection and the battery indicator only maxing out at 94% generally (yesterday, somehow it went all the way up to 97%!).