Effective accessing the AOL mail on iPhone or any other device depends on several factors. First of all, you should have a stable and high-speed Internet connection, the AOL SMTP settings and IMAP settings should be correctly configured and your network router must have enough bandwidth to manage multiple devices on a network. If nothing worked out then try these quick fixes.
· Turn on and then turn off the flight mode.
· Restart the router.
· Make sure you have an active data pack (for cellular plan users).
· Try resetting the network settings.
·Lastly, consult your network provider or call the email experts.