Their Royal Foundation will provide a $3.9 million grant to back the initiative, Shout. The service is designed to help people with a wide range of problems including suicidal thoughts, relationship issues and bullying.
"Texting is private and silent. It opens up a whole new way to find help. It provides instant support. You can have a conversation anywhere and any time, at school, at home on the bus, anywhere," Prince William said. "I am incredibly excited to be launching this service knowing it has the potential to reach thousands of vulnerable people every day."
William added that the group "wanted to back new innovative ways for people to have conversations wherever they are, at whatever time they need someone to talk to. "
The service has already reached 60,000 people, William said.
The Associated Press contributed to this report.