Prolonged Exposure (PE) is an efficacious treatment for posttraumatic stress disorder (PTSD) and is well tolerated. Treatment completion is associated with a long term decrease in mental helth servuce utilization and the VA is engaged in multiple programs to increase the use, dissemination, and completion of PE. The next steps in improving treatment delivery involve examining ways to improve PE treatment utilization, adherence, and outcome. Recently, various technologies (e.g., mobile applications) have been utilized as ways to improve clinical services and reduce barriers to initiating or engaging in treatment. The current proposal will provide an adjunct method of communication during standard clinical care, utilizing existing technology (i.e., texting veterans on their mobile device between PE sessions) to potentially improve PE utilization and treatment adherence. Specifically, patients invited to receive PE through the PCT will be randomized to one of two conditions: receive texts between PE sessions vs. recieve telehpohone calls (i.e., standard care) between PE sessions. Results of the proposed research will help clinicians to examine the role of between session contact, via texting on PE attendance, homework adherence, and treatment outcome. The results of the current proposal have the potential to reduce the rates of PE treatment dropout and improve the delivery of standard clinical services. It should be noted that the texting content will not be different than what is already communicated during standard care via telephone.