Yes, Pre-K (Prepaid Keitais) can be had pretty easily, and for pretty cheap. But be warned, they are expensive to use. I got mine in AKIHABARA TU-KA store right by the JR station. They had a used color pre-k phone that came with a 3000YEN card and a charger for 6900YEN. Pretty easy, quick and hassle free. Just have your friends return your call, so that you don't end up paying 100YEN per minute, and it should be all right. AND YES... incoming calls do not cost you any minutes/YEN.