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Bluetooth-enabled devices are vulnerable to bluesnarfing attacks when in discoverable mode because hackers can respond to queries from other Bluetooth-enabled devices, thus gaining unauthorized access to information.
Most mobile phone discovery modes are activated by default. Unless the mode is deactivated, a device is susceptible to bluesnarfing attacks. The only way to fully protect a wireless device against bluesnarfing is to turn off Bluetooth. Keeping the phone in "invisible" mode provides some protection.