In a speech, he said: "I cannot tell you how pleased William, Catherine and I are that the dial seems to have shifted and that there is now greater understanding, compassion and kindness for anyone who opens up about their struggles.
"I read recently that young people check their phones at least 150 times per day - I'm sure we could all be more effective and efficient if we took a moment to process our thoughts rather than rushing from one thing to the next."
Later in the day, the Prince, who is patron of the Rugby Football League, spent time at Headingley Carnegie Stadium, the home of Leeds Rhinos, along with players, schoolchildren and mascot Ronnie the Rhino.