Compatible Replacement Volume On Off Main Flex for Sony Xperia Z1 C6903. This High Quality Volume On Off Main Flex assembly for your Sony Xperia Z1 C6903 is the perfect solution to fix if you are not able to put volume on and off from power button and gives you a whole New Sony Xperia Z1 C6903 Phone. Include: Sony Xperia Z1 C6903 Volume On Off Main Flex. This will repair the Volume On Off Main Flex. This only fits the Sony Xperia Z1 C6903.