Every time the TARGET phone changes SIM cards you will instantly receive an SMS alert on your own phone telling you that the SIM card has been changed. Because the SIM change alert came from the new TARGET phone number to your own phone simply update your phone address book with the new TARGET phone number that FlexiSPY sent you.
This means you do not need to worry about whether or not FlexiSPY will stop working as soon as the TARGET phone changes SIM card. FlexiSPY makes it easy and convenient to monitor others and SIM change alerts are only one part of a wide range of great FlexiSPY features.
If someone you know constantly changes SIM cards and you are using FlexiSPY to monitor them then the SIM change alert feature is just what you need.