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Blue means it was sent via iMessage, green means it's an SMS. If my wife sends me an SMS, it will be green. The colour doesn't signify verification.

• mh- 4y ago
  He's talking about verified messages from Apple themselves. They have a grey background and a checkmark next to the sender name.
  • blowski 4y ago
    Oh I see. I don't think I've noticed one of those - are they used in the UK?
    • mh- 4y ago
      I've only seen them when you contact Apple support via chat. Like for warranty service on AppleCare.