Old thread, but still useful to know.
If you want to freeze motion, you have to use a shutter speed suitable for your subject.
1/250s will be enough to freeze a walking human, but for a bicycle or a running human you might need 1/500s. A car running at high speed will require 1/1000. You can search for "shutter speed charts - guides" to find out more.
Keep in mind that lowering the shutter speed will allow less light to reach your sensor, therefore you need to compensate by increasing the ISO (in a "real" camera you can also adjust the aperture, but this is constant in phones). You can also add more light to your scene.