You may lost text sound notifications with incoming texts alerting you with a sound whenever you receive a text.
After i OS update, many users complained their i Phone’s ringtone not working.
You can set any of them to be your i Phone's default text tone.
Every time you get a text message, the default tone will sound.
You can also do the same thing with text messages by changing your i Phone text tones, too.
Every i Phone comes with a couple dozen text tones.