With the increasing prevalence and ease of accessing the Internet and email through one’s mobile device, it is important to assess the impact this method of access has on web survey data collection. 91% of Americans own a mobile device and 52% of them access their email in this manner (Pew, 2013). Therefore, it is becoming more common for potential respondents to view emailed survey requests on their mobile devices and in some cases they proceed directly to the survey. This paper focuses on issues surrounding web survey data collection in a population of primarily younger respondents. We assess the effort expended by both the survey organization to reach respondents and the effort needed by the respondent to complete the survey as impacted by respondent device choice. Survey organization effort is examined through average number and mode of contacts (calls and emails) necessary to reach a respondent and length of time in field. Respondent effort is assessed through number of sessions necessary to complete the interview, breakoffs, and interview length. We evaluate paradata and survey content from the fourth wave of a large study of mental health that investigates the risk and resilience of Soldiers in the US Army.