This study aims to test the feasibility and acceptability of a brief behavioral intervention that combines two treatments, Motivational Interviewing (MI) and Cognitive Behavioral Therapy (CBT), that have been shown to work in prior research studies. The format of the intervention will be a combination of in-person sessions and remote elements delivered via mobile phone (together called MI-CBTech). The goal of the intervention is to improve community integration in Veterans with serious mental illness (SMI) who have experienced homelessness. A time- and format-matched control arm will include remote mindfulness training. 50 Veterans with SMI experiencing homelessness will be randomized to one of the two arms (25 per arm).