If you experience your iPhone 5’s text tones, lock sound and keyboard clicks are not working properly, check the solutions below to see if they work out for you:
1. First, go to Settings > Sounds > Ringer and Alerts. Here, you must verify that your volume is turned ON.
2. If your volume isn’t working after the first option, try to perform a reset on your iPhone 5. All you need to do is press and hold down the POWER button and HOME button for some seconds. Once seeing the "Slide to power off" message, don’t release it yet. Just keep on holding both buttons down until you see the Apple logo appears.
3. The last option is that: you need to check back if those tones are purchased one or not. If you had purchased those tones in the past, you need to re-sync those files to your iPhone via iTunes, and then check again to see if your tones works out.