I've got Nexus 4 and not big enough hands to be able to fully control my phone with one hand. I've seen an amazing feature on iPhone 6 called "Reachability mode" (when home button is double tapped, whole UI shifts down to a thumb's reach).
Is there an Android app creating similar reachability mode? I don't have my phone rooted but I can do so.
For all the trolls: please don't write me 'buy an iPhone' not even Samsung, that's not the answer to this question.
Thank you very much!