Correct, and it didn't appear for carriers which were whitelisted (who zero-rated the iMessage activation SMS).
My memory, which may be wrong, is telling me that the first major version of iOS which included iMessage did not include the warning at all, and that it was added for non-whitelisted carriers (aka those which did not sell the iPhone) to prepare the user for the possibility that they will be billed, based on user feedback precisely like the comment to which I was replying.
My memory, which may be wrong, is telling me that the first major version of iOS which included iMessage did not include the warning at all, and that it was added for non-whitelisted carriers (aka those which did not sell the iPhone) to prepare the user for the possibility that they will be billed, based on user feedback precisely like the comment to which I was replying.