iOS 18.4 introduced Priority Notifications, ensuring important alerts are prominently displayed on the Lock screen. However, a recent update added a separate feature called Critical Messages, which allows apps to send vital messages via SMS. Unlike Priority Notifications, these messages are intended for specific urgent situations and are sent through the new Critical Messaging API.
According to Apple’s documentation, this feature enables apps to send critical messages to a range of phone numbers. For example, businesses can use it to check on employees working in hazardous or remote locations. If an employee cannot unlock their iPhone, an automatic message to a corporate contact could help ensure their safety.
Apple’s Restrictions and User Control
To prevent misuse, Apple has set strict rules regarding Critical Messages. Developers cannot use this feature for spam, advertisements, or phishing attempts. Apple explicitly states:
“You may not use the Critical Messages API to send unsolicited messages or to engage in phishing or spamming, including but not limited to engaging in any activity that violates anti-spam laws and regulations or that is otherwise improper, inappropriate, or illegal.”
For users, receiving Critical Messages should be rare, as they are designed for urgent, time-sensitive situations. However, if you find yourself receiving unwanted messages, iOS provides an opt-out option, notes NIX Solutions.
To disable Critical Messages for specific apps:
- Open the Settings app.
- Go to Privacy & Security → Critical Messages.
- Locate the app and turn off its access.
Apple continues refining how notifications work to balance urgency and user control. We’ll keep you updated as more improvements and integrations become available.