Have you ever used a CPL on your iPhone or Android Smartphone? I've justed used one on my iPhone

It really made differences, big difference. 

see the 2 pictures below:

 

 

I used this lens:

It comes with a clip and made it as:

It is suitable for iPhone, Samsung Smartphones:

We also have a Video for this:

If you are interested to the product used, here is the link.