The woman from Sydney's north was taken to Royal North Shore Hospital in a stable condition, the spokeswoman of New South Wales (NSW) Ambulance was quoted as saying in reports.
It is not known if the phone was plugged in to a charger at the time, she said, adding that the paramedics had responded to a number of shocks from mobile phone chargers this year.
Inspector John Brotherhood said it only took a small shock to interfere with your heart.
"Basically, if the jolt moves you, if it takes your breath away or if it's at all a cause for concern, you need to get it checked out," he said.
The incident comes a week after technology giant Apple announced it will launch an investigation into claims that an iPhone electrocuted a Chinese flight attendant who was making a call while charging her iphone.
NSW Ambulance attended 232 Triple Zero calls for electric shocks between January 1 and June 30 this year, reports said.