Whatever it is, it's CRUSHING my battery to death. Almost 20%! I never saw this a single time before iOS 16. I know where I live my coverage isn't great, but I've always used ATT Wi-Fi calling (Almost 4 years now with seeing this icon).
iPhone 13 Pro Max
When your phone fails to detect a cellular network it increases its output power in steps in the hope of finding a more distant network. If it reaches maximum power and fails, it gives up for several minutes, then tries again. But each try uses a huge amount of power, about 1,000 milliwatt-seconds. If it continues never finding a network this will add up quickly. So if you know you have no cellular network connection put the phone in Airplane Mode, then turn on Wi-Fi. This will stop it trying to find a network.
When your phone fails to detect a cellular network it increases its output power in steps in the hope of finding a more distant network. If it reaches maximum power and fails, it gives up for several minutes, then tries again. But each try uses a huge amount of power, about 1,000 milliwatt-seconds. If it continues never finding a network this will add up quickly. So if you know you have no cellular network connection put the phone in Airplane Mode, then turn on Wi-Fi. This will stop it trying to find a network.
One bar requires 10 times as much energy as 4 bars. And if it intermittently disconnects, that’s the same as No Service.
If you see No Service or Searching on your iPhone or iPad
If you see No Service or Searching on your iPhone or iPad ...
Remove your SIM card from the SIM card tray and then put the SIM card back. ... Make sure that the SIM tray closes completely and isn't loose. If you use a SIM tray from a different model iPhone, iPad, or from another phone manufacturer, it might not fit properly.
If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad ...
Learn what to do if you see a SIM not supported alert.
To be able to use any SIM across the globe you must have "No SIM Restriction" against Network Provider Lock. Please refer to the pic below.
Thank you, but I do have coverage - just only a bar or two. That's the way it's been here for 5 years. This all started with me with iOS 16 for me.
What is this new "No Cell Coverage" app I see in the Battery area for iOS 16?
