New platforms such as Windows Phone have a large number of applications yet platform providers currently have a very limited view of what behaviors these applications exhibit in the wild. In addition, these devices are typically resource-constrained, and so cannot support full recording of application behavior. To address these issues, we introduce collective record and replay, a new variation on record and replay that samples the non-deterministic inputs to a program probabilistically across a large number of users. These partial traces are then recombined on the server, allowing a view into the behavior of untrusted applications. In this talk, we will discuss the record and replay framework we have developed for Windows Phone 7. The choice of interface on which to interpose for recording significantly affects the efficiency and efficacy of the system, and so we will describe the tradeoffs of each interface, which one we chose, and why. Finally, we will outline the remaining steps needed to implement our system.