This link demonstrates the method to add APN Solved! “Access Point Name settings are not available for this user” – Terence Eden’s Blog.
I would add that you need to have a good Wi-Fi connection at the time, as I believe the APN will be checked as you Save it (and may be lost if it fails to connect). You have to be very accurate that every line is an exact match with that published by your carrier.
However the APN list on your phone should be populated by the /e/OS ROM from this list apns-conf.xml
Here are the only two lines I see searching for Orange F
<apn carrier="Orange France" mcc="208" mnc="01" apn="orange" proxy="" port="" user="orange" password="orange" mmsc="" type="default,supl" />
<apn carrier="Orange FR-MMS" mcc="208" mnc="01" apn="orange.acte" proxy="" port="" user="orange" password="orange" server="*" mmsc="http://mms.orange.fr" mmsproxy="192.168.10.200" mmsport="8080" type="mms" />
It would be a very serious issue if an update / upgrade wiped this file from your phone, the file is part of system
it could not be wiped by Cache Cleaner.
Please add your build_version_string