How can I get a silent text tone on my iPhone?
You can filter out unwanted texts by assigning a silent text tone to specific contacts in your list. You can also set a silent text tone as the default and use normal text tones for people you want to hear text messages from.
The iPhone comes with a silent text tone. You will find this under Settings -> Sounds -> Text Tone -> None. You can set this silent text tone for specific contacts or as the default on your iPhone.