AM radio on cellphone

Cellphone has only FM, why, because Americans don't need to listen to AM that comes with more commercials or Americans only need to listen musics that comes on almost all FM..or AM has more "money making" potentials that greedy corp-s have not figured out how to lock you on so they are promoting CC /HD radio that you need carriers "service" to listen........or whatever I don't need to find out...................