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I read somewhere, I can't remember where though, that this phrase customization is only on the 2014 Moto X right now but will be added to the 2013 at sometime in the near future.
Posted via a beautiful Ebony backed Moto X on Verizon or the amazing Nexus 10 using the Android Central App
My phone is up to date (OS and apps). I could not train it to respond to OK Moto X. No matter how many tries, it does not let me record or store the phrase...in my case at least.