So far, it's available in Florida, Illinois and Missouri. It's $60 a month for one line or $80 a month for two, unlimited talk, text and data, but you have to be at least 55 years old.
I'm hoping it expands to NJ soon. We could add a phone for my husband for only $20 more a month. I have a 2GB data plan with them right now, and I've been researching cheaper carriers. But I've had trouble-free service from them for several years now, and I dread making a switch. (I had coverage issues with Virgin Mobile and AT&T.) With unlimited, I might even be able to drop our house internet and just use my phone as a hotspot if necessary.