Why can i Imessage from the same number, two different iphones?

I just recently got a new iphone because the other is messed up. But for some reason as i switched over to the new phone, i could still text people who had imessage on the old phone. But people who didn't, i couldnt text on my old phone. Why does this happen? Is it because its not really a "text" message?

IMessage is through your apple ID and can be ran off of just Wi-Fi this does not need cellular service or data to be ran. You can use the same iMessage through your iPhone Mac iPad etc its kind of like face time.

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