Why do iPhones text in different colors?

Why do iPhones text in different colors?

Light blue means imessage (receiver has iphone so messages are free and do not count against any messaging plan you have). Otherwise its green.

If it is blue, then it is an iMessage (aka you are texting someone's iphone, ipad, or ipod touch). If it is green, then it is just a normal text message (aka you are texting someone who doesn't have an iphone)

If a message was sent by Wi-Fi/iMessage, the text bubble will be blue. If it was sent by cellular data, it is usually blue.