I canceled my landline and have been using just my cell phone for several months. It is more convenient to use a cell phone because it is always with me.
I use a prepaid cell phone plan from t-mobile that cost about 10 cents a minutes.
I just purchased a new cell phone, the Nokia 1661, from Target for $14.99.
I also just signed up for google voice and plan on using it as an answering machine.