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I usually use smart connect and NFC tag to fully silent my phone at night time (no vibrate or sound), yet the only option in smart connect is sound, vibrate and priority, and priority mode vibrates. I realise I can now change to full silent mode from the lock screen with the volume button, but i thought it would be an option to put into smart connect as a selection.
That's a good point, I think you should contact Sony Developers directly and suggest this feature:
http://www.sonymobile.com/global-en/support/contact-us/contact-info/