Some Phone sims won’t work on Ipad, can’t set APN
Ipad pro 12.9, I’ve got a couple of grandfathered lines one on ATT and one on Tmobile. They are cellular lines that I don’t use but they are cheap enough that I keep them in a backup phone as I don’t have a land line.
If I put in my ATT sim, I actually see settings to change and edit the APN line and it works and gets internet on my ipad. If I put in my tmobile sim in the ipad there is no place to edit the apn and I can’t get connectivity. I’m on 11.3.x