You should first of all make sure that your iPhone shows home page on its screen. Then, you should locate ‘Settings’ icon on the home page and make a single tap on it. You should then tap on the ‘General’ option given under that icon. After that, you should tap ‘Accessibility’ from the list of options displayed on the screen. You can then view ‘Voice Over’ option for setting up the voice of Siri into normal mode. You have to tap that option for making necessary changes to the voice. Then, you can find ‘compact voice’ item with ‘ON’ and ‘OFF’ options. By tapping on the ‘ON’ option, you can avoid the robotic voice and get it back to the normal voice.