What do the green phone, video, and envelope next to contact mean?

[AC Question]

What does the green phone icon the green video icon and the green envelope icon mean next to the contact on my phone? I have the Samsung Note Edge. These icons only appear on certain contacts text. Please provide a straight answer there are no answers anywhere on the forums. This is driving me crazy! Can anyone provideo an answer? It seems as if it's a bid secret

 

[anon(632115)]

The green phone is to make a phonecall, the video icon is for video calls and the envelope is for SMS/MMS