iPhone users issue a warning about the 'caution' icon on their device.

We live in an age where, if something weird pops up on our phone, instead of immediately heading to the Apple Store, we turn to the internet and hope someone else has figured it out.

With the iPhone 17 reveal just around the corner, Apple fans will soon be scouring forums for tips about features they might have missed.

One iPhone user recently encountered an icon they'd never seen before and turned to Reddit for help.

"What does this caution symbol mean? It just appeared out of nowhere," the user posted.

Next to the Wi-Fi symbol and battery indicator, the attached screenshot shows a triangular warning icon with an exclamation mark inside it. However, the responses from knowledgeable Reddit users weren't encouraging.

According to several tech-savvy commenters, the icon means that the iPhone's 'baseband is dead.'

What is baseband?

The baseband is essentially the communication hub of your iPhone. It's the chipset that manages all cellular functions, not just for iPhones, but also for cellular models of the Apple Watch, iPad, iPad Air, iPad mini, and iPad Pro.

Baseband controls the device's cellular connectivity, Wi-Fi and Bluetooth functions. When it fails, the device loses its ability to connect to networks properly, which is pretty much the core function of a smartphone.

However, the solution was not to be misread.

How to fix baseband issues?

While most tech problems can be solved with the classic 'have you tried turning it off and on again?' approach, this situation is different.

"Restart a few times, DO NOT update or reset," one user argued.

"Hardware issue. WHATEVER YOU DO DO NOT FACTORY RESET THE PHONE OR UPDATE IT TO A MAJOR VERSION, YOUR PHONE WILL BE A BRICK," another user exclaimed.

Other users warned that if the phone is no longer under warranty, the repairs would be 'expensive.'

Meanwhile, another iPhone user offered advice: "Contact Apple if under warranty or AppleCare if these don’t make it go away."

According to Reddit users familiar with the issue, baseband damage can happen for several reasons including: 'liquid damage, interrupted or failed ios update, or the baseband could be unusable because of overheating or just age.'

Essentially, it's a hardware problem that can't be fixed with software solutions, which explains why attempting updates or factory resets could make things worse.

For out-of-warranty devices, it may be worth weighing the cost of professional repair against simply upgrading to a newer model.