If you received a mysterious message on your Galaxy phone that just said "1", there's no need to be alarmed - this was just an internal test that somehow got sent out to real devices. Samsung explained in a message on the Samsung Members app that this message was a mistake and it will have no effect on users' phones. The "1 1" message received by one user The message was sent to a limited number of devices, but the event was not limited to a particular model or country, reaching from New Zealand to Canada, South America to Singapore. If you did receive it, tapping it does...
Source: https://www.gsmarena.com/samsung_mistakenly_sends_out_find_my_mobile_notification_to_random_users-news-41623.php
