In this paper, we describe a study specifically focusing on the situationally-induced impairments and disabilities (SIIDs) which individuals who are blind encounter when interacting with mobile devices. We conducted semi-structured interviews with eight legally-blind participants, and presented them with three scenarios to inspire discussion relating to SIIDs. Nine main themes emerged from analysis of the participant interviews, including the challenges faced when using a mobile device one-handed while using a cane to detect obstacles along the intended path, the impact of using a mobile device under inhospitable conditions, and concerns associated with using a mobile device in environments where privacy and safety may be compromised (e.g. when using public transport). These were found to reduce the quality of the subjective interaction experience, and in some cases limiting use of mobile technologies in public venues. Insights from our research can be used to guide the design of future mobile interfaces to better meet the needs of users whose needs are often excluded from the design process.