Unique visitors count

Hi all,
when i am trying to find the unique visitors count, one thing i have noticed in that, If anyone visits a same page on two different devices(laptop +mobile) its calculating as two visits. But it should be one . How to get this ?thanks.

These are really two different visits. Maybe you want to count user’s visits measuring by his username?
You could try using Custom Variables the every time the same user is returing will count its visit in the custom variable.
Custom variables docs.