Sony ended active support and distribution for the Smart Key app on June 28, 2019 . It is no longer searchable in the modern Google Play Store, though it may still be available for some via direct links for older devices. For Android Users
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Configure the button to answer, end, or reject calls, or even toggle the speakerphone. Sony ended active support and distribution for the
Create different behavior profiles for when you are listening to music versus when you are on a call. How to Download Sony Smart Key App or reject calls
Your Guide to the Sony Smart Key App: Setup, Features, and Alternatives
Smart Key App - Прекращение поддержки и ... - Sony Россия