My brother used to use pay-as-you-go, with his Kyocera Slider. It is great if you don't use it much, especially if you don't use it at set times (you know how a lot of plans offer more night/weekend minutes). However, once he was using it more, it became too expensive so he got a plan. Well, that is part of it, the other reason is that he now doesn't use any minutes to call his wife's phone and vice versa.