Trust me playing with shutter speed on your Smartphone is really fun. So if you want to know how you can do that then i will teach you that. The phone i have is the Zenfone Selfie and here is the tutorial on doing it. Remember that it;s through Manual mode and can only be done through rear camera. 

Steps:

• Go to camera and tap on Modes and select “Manual Mode.”
• On Manual mode go to Settings and tap on “Auto.”
• When to tap “Auto” you can now select your shutter speed time.

This is how you can manage your SHutter speed and do fun with your SMartphone camera.