If you see the SOS Only message pop up on your iPhone, a simple restart or toggling Airplane mode on and off can help fix the issue.

What if these don't work? Both iMessage and RCS require a data connection, whether it's from Wi-Fi or cellular data.

When cellular service is available, your iPhone uses it for emergency calls. If you turn on Wi-Fi Calling and cellular service isn't available, emergency calls might use Wi-Fi calling.

Do your streams keep buffering, downloads take forever, and websites load at a snail’s pace on cellular data? Your carrier could be slowing things down intentionally by throttling your ...

Apple introduced its own C1 cellular modem with the iPhone 16e, but the iPhone 17 Pro models are still expected to use Qualcomm’s modem.