What is the main carrier for iD Mobile?

I'm curious, could you please elaborate on the main carrier for iD Mobile? As I understand, mobile network providers often have partnerships or arrangements with other carriers to ensure seamless connectivity and coverage. In the case of iD Mobile, which carrier serves as their backbone or primary provider for their services? Is there a specific technology or infrastructure that they rely on to deliver their offerings to customers? I'd appreciate any insights you might have on this topic.