This year we "ported" our landline number to a Verizon device that costs a flat $20 per month, long distance included.  It plugs in to your house lines and all the home phones work on it just like the local phone service worked.  

To save your old number you must sign up with Verizon first and then wait until the old service is disconnected, then you will be able to plug the device in and continue with the same number.