If AOL email not working on iPhone, then you should reset the network settings:
Start by opening the settings icon on iPhone.
Click on the general settings option.
Go to the general settings and select the reset option.
Selecting the network reset option will reset the iPhone device's network settings.
Connect the iPhone to the network again.
You can see if AOL mail on the iPhone is troubleshot or not.
Follow these steps to troubleshoot the problem of AOL email not working on iPhone devices.