Parents who are concerned about their children's whereabouts and safety are using GPS-tracking SIM cards that send back location coordinates. The technology also provides an SOS option if the user needs to call for help and can be configured to warn parents if their child has left a designated area, the Herald Sun reports. The technology is an improvement on previous GPS systems because parents can keep track of their children more directly instead of through websites, but, according to the report, privacy advocates are concerned that it could be an invasion of privacy. 
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