I can.
I bought a bunch of cellular iPads off Amazon (“renewed”, aka refurbished) for my business. I tried out a few IoT cellular providers and the first one used regular SIM cards and they worked just fine. The second carrier (that I ultimately went with) used eSIM and while most my iPads joined up without issue I had 7 of them refuse to add the eSIM. While carriers aren’t allowed to lock iPads SIM they _are_ allowed to lock them to only work with their eSIM.
AT&T was the culprit here and you can find multiple mentions of this practice on their forums which appeared to be the only way to get help on this issue. Post a new topic, wait for customer support to come along and PM you, then ask for your iPads to be unlocked (EUICC).
AT&T Forum support ultimately told me “those iPads aren’t in our system, there is no lock on them”. I tried calling in (BTW, they won’t even talk to you unless you are a customer of theirs which, thankfully?, I was for my personal line) and spent hours on the phone with them only to be told the same thing. I want to be clear, I spent over 4 hours across multiple calls where I was told different things but ultimately told “there is nothing we can do”.
At this point I called Apple (Apple Business Manager) where I was able to talk to a real person within <1 min of dialing (normally I spent 10min in AT&T phone tree hell) and they confirmed “this is an EUICC/eSIM lock on the device by AT&T. ONLY AT&T can remove the lock”. I cannot rave enough about how easy it was to talk to ABM and how knowledgeable the person was, not to mention how they were easy to understand and immediately understood what I was asking. It was a stark difference from AT&T.
I called back into AT&T and just kept pushing until someone said they would do it and it’d be fixed in 24 hours. It was not. I had a couple more rounds with AT&T, each with 24-72 hours promises that it would be fixed. This dragged on for _weeks_.
Finally, as a hail mary before I attempted to return the troublesome iPads to Amazon (which was what AT&T support kept suggesting I do), I filed an FCC complaint and in less than 3 days AT&T reached out to me (no more automated systems) and released the lock on all my iPads. The same lock they swore didn’t exist, for iPads they swore were not “in their system”.
So yeah, there’s a case of anti-lock in being subverted with eSIM and the hell I had to go through to get it fixed.