Open AccessMany applications are currently being built for mobile phones that are intended as throwaway gimmicks that people download from places like Apple istore. Users can download small throwaway applications for their mobile phone for as little as ninety nine cents. We were interested in what affect these two components e.g. throwaway and cheapness has on the use of HCI guidelines by the designers of these applications and whether or not it was worth their while incorporating them into their design given the temporary nature of use. In this paper we describe how we tested two designs of the same concept. The first design brief was company led and did not explicitly adhere to any HCI principles and the second was designed according to HCI principles. We tested both applications with users in the field to see which was the simplest and most intuitive to use.