I've recently bought an HTC HD7 running NoDo from America, it works fine with Vodafone, but when I switch to an XT SIM and start it, Connection Manager pops up, and configures it for Telecom, but the no signal indicator still shows, and I can't make calls / go on the Internet.

I've tried adding the APN wap.telecom.co.nz and internet.telecom.co.nz and restarting, but still no change.

With the HD7 available on/soon available on Telecom, I'm confused as to why it's not getting any signal. Does anyone have any ideas that could help?