Hi, we are building an app to sync contacts for event organization. The app can sync between 100 to 1000 contacts to the Contacts app of iOS. We can't manage the device because the user can bring their own device.
We are currently facing an issue with thirdparty application like Whatsapp/Signal/Telegram because they sync the contacts from and to the phone.
- When the sync is enabled in one of this app we can't delete all the contacts at the end of the event because they are synced back to the Contacts app.
- When we update the contact it also get messed up by those apps.
Do you know an workaround to prevent this scenario? Is it possible to prevent thos apps to sync a contact?