BBC has just released new iPlayer app for radio, usable on most mobiles. You will probably know you can download oodles of BBC progs - radio and tv - via podcasts.
iTunes leads to dozens of podcast sites with hundreds of downloadable podcasts on every subject under the sun - well - nearly.
Many mobiles have built-in radio so you can listen to BBC while digging the garden or walking the dog.
iPhone doesn't have FM radio built-in, but with podcasting you can deliver tons of progs - which is better than listening live as you can choose the prog from yr archive.