The 8830 is a dual-mode CDMA/GSM phone. It's picking up a CDMA signal, probably from Telus, Bell, or whatever Mobility carrier serves your part of Canada.
You should be able to set it to GSM-only and get no signal.
When you're in CDMA mode the 8830 doesn't use the SIM.
Last edited by ratatosk : 05-29-2010 at 08:48 PM.