What do I need to build and publish for Android and iOS

I have the latest unity (PRO) version. I need to buy some plugin to build and publish for Android and iOS or what I have is enought?

Quoting Unity’s response:
Today, we’re taking another step on this long road: as of right now, independent Unity developers will be able to deploy their games to Android and iOS platforms completely free of charge. Update Unity and you will find Android and iOS build options (previously basic add-ons) ready and waiting for you to use.