What does the do not disturb button do on iPhone 4?

I put it on bc when I sleep I don't want my parents seeing that I got a text or call but my friend just texted me when I wanted to sleep and i don't know why it's not working bc isn't it not suppose messages to come or calls

The 'do not disturb' button will not block incoming texts, but will only send incoming calls to voicemail.

If you want the phone not to make noise, you need to put it on silent mode, or mute the ring volume.

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