For some reason smartphone manufacturers neglect to tell us that your smartphone camera does NOT take a photo when you tap on the shutter button. The camera takes the photo when you RELEASE the shutter button, or at least it does on iPhone and Android phones that follow the OS specs.
So... when you are trying to get that photo of your kids, pet or a group that's in motion, try this: Place your finger on the shutter button and release it when you see the shot you want to take.
You'll avoid shaking the phone by not tapping on the shutter button. You could get a shot of your friends or kids smiling! Better photos in less than 30 seconds.