If you’re finding that iMessage effects are not working on the IPhone 7, there’s a really simple reason why.
The reason iMessage screen effects and bubble message effects are not working is because they have the Reduce Motion setting enabled.
Another reason iMessage effects may not be working is if the device you’re on is not actually using iOS 10. You need to update the software on the IPhone 7 to iOS 10.
To turn Reduce Motion off carry out the following steps:
If you have Reduce Motion off and iMessage effects still aren’t working, try the following:
Press down harder on the send button because the Message effect uses 3D Touch.
Quit Messages and launch it again (double-tap home button and swipe up on the Message app)
Force reboot the IPhone(hold down the Power and Home button until you see the Apple logo)
Turn iMessage OFF and back ON again through Settings > Messages
Disable 3D Touch (if applicable to your IPhone) by going to Settings > General > Accessibility > 3D Touch > OFF