Promoting Safety Plan and Coping Strategy Use Among Adults With Suicidal Thoughts

The goal of this study is to learn about a new, real-time, smartphone-based intervention aimed to decrease risk for suicide in adults who have been hospitalized for suicidal thoughts or behaviors. The main questions the investigators aim to answer are: * Is a real-time, smartphone-based intervention that promotes the use of safety plans and other coping strategies for suicidal thoughts feasible and acceptable? * Does the real-time intervention result in increased use of safety plans and other coping strategies, and reduce suicidal thoughts? Participants will: * Answer questions about current suicidal thoughts on their smartphone up to 6 times each day while they are in the hospital and during the 4 weeks after they leave the hospital * When they report elevated suicidal thoughts on a smartphone survey, be randomly assigned to receive or not receive automated, interactive reminders to use content from their personalized safety plan or general coping strategies * Answer brief follow-up questions on their smartphone within a couple hours of receiving or not receiving automated reminders * Give feedback on their experience with the real-time intervention