All the info I got from ST sites & sources were wrong for my ported Lumia 635. The following site had the best & most info for Lumia and many other phones. https://apn.gishan.net/settings/816_11_ ... ia_635.php
This site has many potential settings listed.
Since I don't use all the functions on my phone, I don't know if everything is working now for sure. The only thing I know I don't have that I had before porting is I lost visual voicemail. Voicemail is working but I have to call my voicemail box.
To ST forum staff, why are so many of your replies to APN questions are to "go offline" with the inquirer? Aren't forums for sharing info, ie sharing problems AND THE SOLUTIONS?