I just received this router via UPS yesterday and got it setup this morning... I was hoping that I’d be able to clone my business cell phone’s sim card and place it in the ”line2” sim card slot so that when I’m at home (very rural area with poor coverage) I’d be able to make/receive calls via VoIP... but alas there is something missing on your normal sim card that allows it to register with the VoIP server or something. But if you want to take your ”home” phone sim card and place it into your cell phone, I tested that and it DOES work... so maybe we can figure out how to make our cell phone sims to work with VoIP via some kind of hack... that would be AWESOME, and I think would bring a LOT of new customers to T-Mobile if it became a possibility!!!