I currently have a cheap Fido voice plan for my phone here in Canada. No data plan. I want to get an iPhone, unlock it, and put my Fido SIM inside. I just want to use the voice part of the phone, and the iPod part, and I only want to use Wifi for data. Will it try and access the data network here and charge me up the wazoo? Or can I tell it that the data network doesn't exist so it doesn't try to connect to it when there's no Wifi?