When I used instagram my phone vibrates time to time

Howdy Shadow1137,

Thanks for posting in the Apple Support Communities.

It sounds like your iPhone may have received a notification that only has vibrate enabled as a notification method. Check out the following resource to see if this helps in determining if that's what occurred: Customize iPhone for vibration sensitivities - Apple Support

If you have a sensitivity or intolerance to vibrations, you can customize iPhone to suit your needs.

• Set vibration options for specific alerts: Go to Settings  > Sounds & Haptics. See Change iPhone sounds and vibrations.

• Turn off all vibrations: Go to Settings > Accessibility > Touch, then turn off Vibration.

If that doesn't seem to be related, confirm that you have the latest updates installed via the App Store to see if that will help. For assistance with updating your apps, check out this resource: How to manually update apps on your Apple device - Apple Support

We hope this is able to help.

Have a great day!