I just upgraded from iPhone 13 to iPhone 16. Now my apps will not work on 5G, only when connected to wifi. They are all set to work with cellular. I've done a restart and a network reset, still not working.
iPhone 16, iOS 26
I know it sounds crazy but have you tried toggling off, then back on: Settings > Cellular > Cellular Data > Off
It's been a while but there have absolutely been situations with previous iOS versions where I found that the indication for a specific setting did not reflect the actual state of the feature. Almost like the setting key didn't didn't exist until toggled once. I know this is a long shot but is easy enough to try. I personally would disable that global Cellular Data setting, disable Cellular Data for a few of the specific apps, change to AirPlane mode, power off and then on the iPhone, and then re-enable Cellular Data globally and for each of the apps.
I know it sounds crazy but have you tried toggling off, then back on: Settings > Cellular > Cellular Data > Off
It's been a while but there have absolutely been situations with previous iOS versions where I found that the indication for a specific setting did not reflect the actual state of the feature. Almost like the setting key didn't didn't exist until toggled once. I know this is a long shot but is easy enough to try. I personally would disable that global Cellular Data setting, disable Cellular Data for a few of the specific apps, change to AirPlane mode, power off and then on the iPhone, and then re-enable Cellular Data globally and for each of the apps.
Check to see if you have a carrier update:
Manually update your carrier settings on your iPhone or iPad - Apple Support
There isn't anything that says an update is needed or available.
iPhone 16 apps won't work on 5G
