Any phone that supports SMS, even old cellphones, can communicate with iPhones and appear in green bubbles. iPhones use Apple's iMessage system and display a blue bubble around the text.

The history of blue and green iPhone message ... a seamless and free way to send text messages, photos, videos, and more. The color difference of message bubbles was a visual cue to distinguish ...

Apple uses consumer psychology to make it feel like the "cool" brand, which the DOJ says created a "social stigma" toward non ...