Hi there! It sounds like you’re having trouble opening the Pinwheel Attendance App on your iPhone after your son inserted his SIM card into his Pinwheel device. Just to make sure I understand correctly: is the issue that you can’t open the parental control app on your iPhone itself, or is it on your son's Pinwheel phone? Also, are you receiving any specific error messages or does the app just not launch?

While I wait for your details, here are a few things we can check quickly:

1. Restart your iPhone: Sometimes a fresh start helps apps run properly.
2. Check for app updates: Open the App Store, go to your updates, and see if the Pinwheel app has an update pending.
3. Verify your app login: Sometimes parental controls require you to be logged into your caregiver account.
4. Check network connection: Ensure your iPhone has a good internet connection; the app may need connectivity.

If those basics are fine and the app still won’t open, it might be related to the SIM card activation or permissions. The Pinwheel system does rely on activated SIM cards and parental account settings for control, as seen in their setup guide1 and parental-only settings page2.

Could you please confirm if your son’s SIM in his Pinwheel phone is activated and working as expected? Also, have you tried opening the parental controls from the designated Pinwheel Caregiver Portal or app installed on your iPhone, or is this a different parental control app?

With that info, I can guide you further!