Sometimes only get audible sound on iPad not iPhone

I have an iPad and and iPhone, and when I receive a text message I only get a sound on my iPad and not my iPhone. Not do bad at home, but when out I miss important texts from my kids because often, but not always, my phone won't make a sound or vibrate. This is important to fix, any suggestions please? It is not an always thing, only sometimes to often.

iPhone 6s, iOS 11.2
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Hello and welcome to Apple Support Communities, Guitardoug.

If I understand your post correctly, your iPhone sometimes makes no sound or vibration when you receive calls or other notifications. I understand how important it is to be alerted to all your messages. I'd like to help.

Try the troubleshooting steps in this article:

If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker

For more details about Do Not Disturb, check out this article:

Use Do Not Disturb on your iPhone, iPad, and iPod touch

Let us know if that resolves this issue for you. 

Thanks for using the Apple Support Communities. Take care.

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