Nokia is encouraging users to ignore or delete the messages and to resist the temptation to reply. If you’re unsure of who the message has come from, you should most probably delete the message. Certainly don’t respond with your personal details. If you reply, or act on any other requested action it’s possible your personal information could be misused.
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Given the open nature of the Internet, the best thing you could do would be to delete the messages without responding.
Nokia is working with the relevant authorities to try and stop this activity.