I wonder if anyone who is more "up to date" with various phone plans can help me. I've got a T-Mobile 6100T that works very well with the HFL. My girlfriend has a Verizon phone and it's getting very expensive for us to talk to each other. Is there a Verizon plan that I can get that is ONLY "in network" calling for a low monthly price that is also HFL compatible? Or should I get her a T-mobile phone instead, and add it to my existing plan?