What can I do if I have noticed activity on my iPhone that seems like a hacking attempt to stop it before it goes any further?

On Tuesday, July 8, 2025 something very weird happened to my iPhone 16 on T-Mobile with an eSIM in the U.S.; personal device. Sharing the just in case anyone else experiences similar.

 This all happened on an iPhone 16 (MYD33LL/A) running iOS 18.5. At around 7:00pm, I was looking at my iPhone home screen and noticed that the temperatures my weather app on my iPhone 16 (running iOS 18.5) suddenly changed from Fahrenheit (U.S. region) to Celsius. Like it was 80-90F and the app was showing temperatures that were 20-30C. Very odd because I didn’t do anything that would cause that. *** **PS**: I didn’t receive any SMS messages, emails or notifications of anything about anything. I simply saw temperatures in Celsius and my “Language & Region” set to “world” which is not a region that is offered by Apple during the initial iPhone setup or even afterwards in “Settings -> General > Language & Region.” Very odd. **PPS**: No other Apple device that is associated with the iPhone Apple ID was affected. Two-factor authentication for the Apple ID is set, its password hasn’t been changed but again, two-factor authentication is set. **PPPS**: I just sent an email to product-security@apple.com that is basically a condensed version of this post just in case this is a novel (aka: zero-day) exploit.