Impressive nonetheless... however but pick any current model smartphone and the same could be said.

From the article...

So, what exactly was used? According to AppleInsider, two iPhone 5s’ were mounted onto $75 BeastGrip lens adaptors that allowed them to use threaded lenses, including the $38 Neewer 0.3X Baby Death 37mm Fisheye Lens, as well as a Schneider iPro lens, which you can buy in a kit for $230. Oh! I almost forgot — they also used one of Freefly’s $5,000 MōVI M5 gimbal stabilizers for all of those beautiful handheld shots. As far as software goes, the “fast and dirty” edits were made using iMovie, while the $5 FilMic Pro was used to offer more control over their cameras — it’s kind of like the Camera+ for video.