A movie that was a hit at the recent Sundance Film Festival was created using the iPhone 5S.
http://www.theverge.com/2015/1/28/7925023/sundance-film-festival-2015-tangerine-iphone-5s
They used a Steadicam stabilizer, prototype anamorphic lenses,and the Filmic Pro app.
The lenses
https://www.kickstarter.com/projects/moondoglabs/133x-anamorphic-adapter-lens-for-iphone-5-5s
The Steadicam model
http://www.tiffen.com/steadicam_smoothee_homepage1.html
The app
Www.filmicpro.com
http://www.theverge.com/2015/1/28/7925023/sundance-film-festival-2015-tangerine-iphone-5s
They used a Steadicam stabilizer, prototype anamorphic lenses,and the Filmic Pro app.
The lenses
https://www.kickstarter.com/projects/moondoglabs/133x-anamorphic-adapter-lens-for-iphone-5-5s
The Steadicam model
http://www.tiffen.com/steadicam_smoothee_homepage1.html
The app
Www.filmicpro.com