Comment 0 for bug 1315509

In order to support Carrier customization of apns-conf.xml, ofono should search for /custom/apns-conf.xml first, and if it exists, use it to override APNs found in the default apns-conf.xml.

Note, this would only allow us to replace an existing APN in apns-conf.xml. If we need the ability to disable APNs without replacing them, additional logic would be required.