The National Suicide Prevention Lifeline — the number posted on student identification cards, atop Google search results and in warning labels on television shows — is about to get a major reboot, casting it as the 911 for mental health.

With an infusion of federal money, the upgraded Lifeline starting in July will have its own three-digit number, 988, and operators who will not only counsel callers but eventually be equipped to dispatch specially trained responders. That will reduce interventions by armed law enforcement and reliance on emergency rooms — and ultimately keep people alive, advocates say.

But there are growing concerns that the 24-hour hotline, already straining to meet demand, will not be able to deliver on the promises of the overhaul unless states supplement the federal money with significant funds for staffing, according to interviews and government reports.