Many phones (if not all) allow you to change what's on the SIM for the message centre. Some providers have different message centres for different customers.
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4 years ago
SMS messaging
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4 years ago
Bob, you?re replying to our resident troll, Rod. He?s nym-shifted again.
Tim
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4 years ago
Oh God, thanks. Killfiled.
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4 years ago
It's often sent out in a provisioning message when you activate a new SIM.