Monitoring an iPhone requires that the phone first be jailbroken. Unfortunately, if you're seeing a message that your iOS is not supported, it means there is no jailbreak available for your specific device model + iOS combination.

New jailbreaks are released from time to time, so we recommend you sign up to our newsletter, which you can do at the bottom of the homepage to be the first to know when a jailbreak becomes available.

If you don’t want to wait, then you can purchase a phone with FlexiSPY already installed using FlexiSPY EXPRESS: https://www.flexispy.com/en/express.htm