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A popular GPS tracker - used as a panic alarm for elderly patients, to monitor kids and track vehicles - contains security flaws, which security researchers say are so severe the device should be recalled. The Chinese-manufactured white-label location tracker, rebranded and sold by more than a dozen companies - including Pebbell by HoIP Telecom, OwnFone Footprint and SureSafeGo - uses a SIM card to connect to the 2G/GPRS cell network. Although none of the devices have internet connectivity and won't be found on exposed device database sites like Shodan, they still can be remotely accessed and controlled by SMS. Researchers at U.K. cybersecurity firm Fidus Information Security say the device can be tricked into turning over its real-time location simply by anyone sending it a text message with a keyword. Through another command, anyone can call the device and remotely listen in to its in-built microphone without alerting anyone. Another command can remotely kill the cell signal...