In Apple's Messages app starting with iOS 7, a green bubble surrounding the text means the incoming message came from a non-Apple phone that uses the standard SMS/MMS text messaging system (see SMS).

The history of blue and green iPhone message bubbles is tied to the development of iMessage, Apple's proprietary messaging service. It was introduced with iOS 5 in 2011, offering iPhone users a ...

After years of forcing all users to message in the same old green speech bubbles, WhatsApp is now opening up its interface to ...