Now Mobile app’s “voice search” uses native speech recognition and relies on mobile device's cloud server to transcribe voice into text search. We require specific details of the cloud server/service that is used for iOS and Android devices to be able to assess data privacy concerns. Reference article: https://docs.servicenow.com/bundle/newyork-mobile/page/administer/mobile-employee/task/turn-on-voice-search.html

Our mobile apps use native iOS & Android speech frameworks to be able to use the dictation feature to transcribe voice to text. Apple and Google process this data in their servers to be able to reliably determine the dictation. And If you are worried about privacy, you can enable Offline Dictation on iOS & Android operating systems which allows you to be able to use dictation without going to a 3rd party server