What is SOS on iPhone? Here's what it means.

What is SOS?

You try to make phone call or post on social media on your iPhone – but you can't. Do you have bad service? No – in fact, you have no service. The service bars on your iPhone aren't just low, they are completely missing. 

In place of the bars? "SOS."

What does 'SOS' mean?

SOS mode is a way for your iPhone to make emergency calls even when you are completely out of service. 

It's obviously good that this SOS feature exists. But seeing it often means that something is wrong with your cellular service and your iPhone can't make calls, receive calls, send messages, access the internet, nor do anything else that requires a cellular connection.

But even without any cellular service, SOS mode allows iPhone users to call 911 and share their location in the case of an emergency.

How does SOS mode work?

If you have no cellular connection, how do calls to emergency services still receive calls?

SOS mode has evolved a bit with newer iPhone models. Previously, if SOS mode was activated, your iPhone would be able to access any service provider's network – not just your service provider – in order to connect with 911.

Since iPhone 14 and later, Apple has been able to utilize satellites in order to connect with emergency services when needed.

Based on spiking trends on search engines, it appears many users are still unaware of the SOS mode features. Seeing "SOS" on your iPhone usually means doom at first sight. There are outages with your carrier and you won't be able to use your phone at the moment.

But the fact that iPhone users can still get help in an emergency should still be a welcome sign – even if the "SOS" message itself isn't.