Police are currently seeking information to help them locate Chloe Richards who was last seen in Halls Head on Monday, July 24.
It's understood the 15-year-old made brief telephone contact from the Mandurah Forum on August 1.
Chloe is believed to be somewhere in the Mandurah area but could have travelled further into the metro area.
She is described as looking much older, but the picture below is an accurate image of her.
It is not known what she could be wearing at this time.
Anyone with information that may assist police in locating Chloe is asked to call 131 444 immediately and quote IR 040821 1505 16419