I work in Detroit at the Renaissance Center and my phone will periodically connect to the Canadian (Verizon) cell towers. Is there a way to prevent this? I've tried to update the PRL via *228 but it apparently doesn't work on 4G phones with a SIM card. I'm not convinced it would work anyway as my 2nd phone (work) is a Blackberry and it does the same thing (I am able to update the PRL on that device). I'm hoping someone knows how to prevent it from connecting to the Canadian signal. The phone asks me if I want to enable data while roaming, which is nice, but I don't want it to see/use the signal at all. Thanks.