AT&T says its new smartphone product Call Protect blocks some robocalls before they even reach a customer’s phone.

When there is some doubt about whether the call is real or robo, it isn’t blocked but shows a “suspected spam” warning on the incoming call screen.

“Nuisance calls are an industry-wide problem that unfortunately affect many people,” said Jeff Bradley, senior vice president, Device and Network Services Marketing, AT&T in a statement.

“We’ve listened to our customers and know they want a network that provides tools to proactively assist in blocking nuisance calls. AT&T Call Protect, along with others, will help put customers more in control of the calls they receive.”

AT&T customers can get the free network-based service by downloading the Call Protect app.

AT&T disclosed the new app in a news release.