Hello, I have never used Android before, today I received my Nexus 4. I was very excited thinking Voice/GoogleNow was far superior then Siri on iPhone. How can I activate voice/GoogleNow while the phone is on lock screen using my headset. It is a 3 button headset, and yes it does work. While unlocked Music Playing works Activating google search works While locked Only music features work. I mainly use my phone when walking, or driving. On iPhone it was easy to activate Siri, I hold the button, it asks me what I want even when the screen is locked and reads back the SMS messages I would like to send using voice. On my nexus, not only does it not read back my messages to me, I cannot seem to activate it while its locked and in my pocket. Making it almost useless when it comes to driving and walking with phone in my pocket. I must be missing something, doing something wrong and I definitely feel I am not alone with this issue. Android must be equipped to do the necessary functions I need. Thanks ahead of time!