A little voice came on the phone and introduced himself as Roman.

The four-year-old boy had touched his mom's thumb to her phone and used Siri to call for an ambulance. His mom, he said, was "closing her eyes."

SEE ALSO:Amazon might update Alexa with voice recognition

"Can you do me a favor?," the emergency responder on the call asks Roman. "Can you go and get mummy?"

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"We can't," Roman says. "She's dead."

Roman told the responder his mom was "not breathing." He gives his address to the woman on the other end of the phone, then shakes his mom, as requested.

"She's not waking up," Roman says.

An ambulance got to the boy's London home in 13 minutes. Responders barged in and administered first aid. She woke up, and they took her to the hospital.

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