verizon, and as low as 19 bucks a month for republic wireless, with lots of options in the middle f that price range.
All of our family and most of our friends are on Verizon wireless. So there are never any extra charges when we call each other. We initially removed the long distance plan on the landline and then shortly thereafter cancelled it.
Also at one time wired carriers maintained their systems and you could always count on dial tone being there. Not so much anymore. I think a good wireless carrier (they are definitely nor all the same) is more reliable today.
Thats easy. There are BT docks you can buy to connect your cellphone to your house phones.