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Info that is on your phone will not be lost. Message strings may not be able to continue, and may have to be started afresh, but the old info will still be there.
My initial prepaid phone number had daily nuisance spam calls. I changed the number. About two months later I was getting spam calls on it too. The emergency phone number was NEVER given to anyone. The new number was likely abandoned by someone prior who had too many spam calls too.
Looking forward to the new phone local.