1. iOS 18 Will Support Satellite-Based Messaging: The upcoming iOS 18 update will introduce support for satellite-based messaging, allowing users to send and receive messages in areas with no cellular or Wi-Fi coverage. This feature is expected to be particularly useful in emergency situations or when traveling in remote locations.

2. How Satellite Messaging Will Work: The article explains that the satellite messaging feature will work by using a combination of satellite connectivity and a specialized app on the user's iPhone. Users will be able to compose and send messages, which will then be routed through a satellite network and delivered to the intended recipient.

3. Potential Costs and Limitations: While the article notes that the satellite messaging feature will be available on iOS 18, it also mentions that there may be associated costs for using the service. The article suggests that users may need to pay a subscription fee or per-message charge to utilize the satellite connectivity. Additionally, the feature may have limitations in terms of message size, delivery speed, and availability in certain regions.