iPhone 5s, can't get iMovie for free

Hey!

I just bought and activated a brand new iPhone 5s 16gb, and as far as I know I should be able to download iMovie, Pages, Keynote and such stuff for free as I was able to do it with my iPad Air. But when I log in and try to download it from AppStore, they are not free, there are regular prices shown.

Is there any reason for that or maybe I am doing something wrong?

Thank you in advance!