For some customers the new technology now gives them a warning that comes up on their phone screens, such as “SCAM RISK” when a call comes in from an unverified source, giving the customer the option to pick up or ignore it.

Other steps taken by providers include blocking all calls from numbers that couldn’t possibly exist because of the combination of area code and prefix on its caller ID, and allowing customers to routinely block all calls with no caller ID, upon request.

The Federal Communications Commission set a deadline of June 30 for cellphone service providers to adopt caller ID verification, with a three-month informal grace period set to expire next week.

The five biggest cellphone providers — who together control 99 percent of the market —have adopted the new technology, with some exceptions for small portions of their networks, according to a new report by Massachusetts Public Interest Research Group, or MassPIRG.

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