01/09/2014 01:04 EST | Updated 03/11/2014 05:59 EDT

Sarnia, Ont., cops seek mystery 911 caller; more than 360 calls since Christmas

SARNIA, Ont. - Sarnia, Ont., police are asking for the public's help solving a mystery.

They say they've received hundreds of 911 calls from the same cellphone since Christmas Day but they don't know who the caller is.

There have been more than 360 calls — including one day when there were 58 — and police say it’s likely a Rogers customer on a phone that has no SIM card.

When the call is answered, police say there's a garbled message from someone believed to be a small child or possibly someone with a disability.

They say it's possible someone got a new phone for Christmas and gave their old one to a child without realizing 911 calls can still be made on cellphones that have no SIM card or service.

It's been determined the calls are being made within a one-kilometre radius (around Wellington and Stuart streets) in the southwestern Ontario community.