AT&T is the first wireless carrier to block robocalls after a recent Federal Communications Commission (FCC) ruling paved the way for cell phone carriers to do so.

AT&T just announced an expansion of its Call Protect service that will automatically block robocalls suspected to be fraudulent free of charge. Users are also free to manually block individual numbers of known spam callers. But if a consumer wants to automatically block all robocalls, even those from legitimate businesses, it will cost an additional $4 a month.

“The FCC has been a tremendous partner in the war on robocalls,” said Joan Marsh, executive vice president of regulatory & state external affairs for AT&T Communications. “The Commission’s recent action builds on a years-long effort to enable broader adoption of call-blocking tools and allow providers to better protect their customers and networks. AT&T remains committed to working with our government and industry partners in the ongoing battle against unwanted and illegal robocalls.”

Call Protect was previously an opt-in feature: Users had to change their phone settings in order to take advantage of it. Due to the FCC ruling, AT&T can now activate Call Protect on all phones.

The benefit is expected to be available to all new AT&T service sign-ups, with existing users added in the coming months. If you don’t want to wait, you can download Call Protect as an app or turn it on via your AT&T account.

While AT&T is the first carrier to make the blocking feature a default, other cell phone providers, such as T-Mobile, offers a Scam Block service that blocks spam calls.