After Facebook has a series of Google. If you have an Android phone registered with Google services, Google adjusts your phone number to your profile on Google Plus which he plans to turn into yet another de-anonymizing tool.
All phones have an ID for identification calls. But since 2014, Google adds Android ID to Google Plus profile.
If you've entered your phone number with Google, then it looks like you do not care, so this post is probably not for you. If you do not wish to have the number on the internet, read below.
Google Plus profiles require a real name, a policy Google is trying to apply literally, even to the point where some users are forced to send their IDs.
So if someone calls you they will be able to see her photo that you have at Google Plus and your real name.
With the "Smarter Caller ID” by Google one feature which appeared in 4.4 Android KitKat, you won't need to be in someone's address book for them to see your name and profile picture when duration of calls. Even if a complete stranger accidentally calls you, they will be able to see your name and photo.
If you do not like the idea, just visit the address https://www.google.com/settings/phone and change the settings.
