Originally Posted by mitsosJL
So I have to find a kernel which enables it uhh?
Have the processor do not mean you have that option on your phone, like DT2WU. Also can be vary different from 4.3 to 4.4,because on 4.4 it can be managed differently. BTW, on my 4.3 I have some kind of Voice Search in Settings > Language & input > Voice Search. I don't know if you looking for that as Voice Activation seems to be something else, like Activate the phone by Voice and for that you need a kernel, so on 4.3 that is the only option I got.
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My Evolution: Sony Xperia Z1 - UB + 4.3 Rooted + Deodexed, HTC HD2, HTC Diamond 2, HTC HD Blackstone, Nokia 7070 Prism, Qtek 9100, Nokia 3100, Motorola T720i, Nokia 3310, Sony Ericson PF 768 (Blue)
How Get Root on Sony Xperia Z1 with Locked Bootloader and the Latest Android 4.4