Am I missing something but if you are at home couldn't you use your telephone (the one with the broadband) or use VOIP. Why would you use your cell over your own infrastructure and let vodafone charge you for doing so. Now if you got a discount for making calls via the femtocell i.e. you got a discounted rate when at home then (if the price was right) you could use your cell all the time and not the house phone.