The benefit is enormous if you have a large smartphone!

I have the Sony Xperia Z Ultra. Here much has been said, therefore, in brief:
- I always carry it in your pocket
- I'll never do it out
- I invite it every 3 days on (as long as it holds in any case)
- The contact with the smartphone has been lost, couples it close again by itself.
- NFC works great as well, but I use no longer, it couples itself.
- You can see who is calling, a big advantage (for sorting)
The greatest idea to, to make calls to large smartphone.
My absolute recommendation.

PS It is so small that people think you make a call in the hand !!