Tips: How to get "Raise to Speak" to work!
First, make sure that, Settings->General->Siri ON, ->Raise to Speak ON
and Bluetooth/earphone is off
1) Turn the phone's screen on (you can be on the lock screen)
2) Hold the phone so the screen is facing you (as if you are reading from it). Phone can be in front of you at eye level, or chest level or waist level, as long as the screen is on and is facing you
3) Raise the phone to your ear as if you were taking a call - don't move too slowly, faster gesture is better
4) Once the phone is at your ear, wait for a moment for Siri to activate - you will hear two beeps as indication of Siri activating.
5) Speak your command and enjoy!