You are probably using a card from the provider beachSIM. These cards currently do not work with the Pro-finder. When you insert a new SIM card into the Pro-finder, the Pro-finder sends an SMS message with a status query to your smartphone. Due to technical reasons, the beachSIM card cannot process this query and hence does not send a reply to the Pro-finder. As the Pro-finder does not receive a confirmation, it keeps sending further SMS messages with a status query to your smartphone every minute. beachSIM is currently working on this problem. Until a solution is found, SIM cards from beachSIM can unfortunately not be used with the Pro-finder.