Debugging
Field Testing Mode (iOS)
- Call
3001#12345#to access the Field Test Mode on iOS.- This wasn’t working on my iPhone 16 Pro Max on iOS 18.4 (developer beta)
- Call
*3001#12345#*this gets you into a separate menu.- This did work
Resetting Network Settings
Ultimately what ended up fixing my issue was resetting the networking settings. This is under reset iPhone → reset → reset Network Settings
WARNING
No longer sure if this actually worked.