[Swordmaker]

Can ultra-high sounds invoke Siri or other voice activated services on smart devices to issue malicious commands? Chinese researcher says yes, they can. . . but what he claims, such as using Siri to download malicious apps from a website to an iPhone or iPad. Perhaps on an Android device, but not on a iOS device. — PING!

Pinging dayglored, ThunderSleeps, and ShadowAce for their ping lists.

Are Voice Activated Devices Susceptible To
High-FrequencyVoice Command Hijacking?
Ping!

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[Swordmaker]

An attacker could assault an Apple iOS device using Siri to make a phone call or send a text message, but it will not allow the attacker to open a website or download any malicious apps, transfer bank account information, or even open the iPhone or iPad to access any private data.

This is also a "local" exploit, requiring the hacker to be close to the target device. It is also a general attack that cannot single out specific user's device from among all others in the area unless the device is isolated. If the attackers is close enough to attack the device, he's already close enough to eavesdrop on any conversation the target may be engaged in having. In addition, texting using this technique would require zero ambient background conversation to override the intended text. In other words, this sounds like a neat, but extremely impractical, trick hack to accomplish anything malicious.