From the article posted in PubMed:

The main objective of our study was to investigate the impact of individually tailored short text messages on the rate of psychiatric hospital readmissions, health care service use, and clinical outcomes. In addition, we analyzed treatment costs.

From the Wall Street Journal summary: A recent study has found evidence suggesting text messages could reduce one’s odds of a second heart attack. A six-month clinical trial in Australia found that patients recovering from a heart attack were more likely to maintain lower blood pressure, less body fat and lower cholesterol levels than a control group when the patients received text messages asking and giving suggestions about their health routines. Patients receiving the texts also were more likely to be active and to quit smoking than the patients in the control group, who didn't receive such texts.

From the article in JMIR:

The risk of poor sexual health, including unplanned pregnancy and sexually transmitted infections (STIs), is greatest amongst young people. Innovative and acceptable interventions to improve sexual health are required. Mobile phone text messaging (short message service, SMS) interventions have the potential to reach large numbers of people at relatively low cost, but greater understanding is needed on how these interventions should be developed and how they work.

mFHAST Implications: Opportunity for text messaging interventions to promote safer sex behavior in young people.