It was possible with my OnePlus 5 with Android 9.
I slightly altered my T-Mobile APN for a 2nd APN (changed the APN Protocol & APN Roaming Protocol to IPv4/IPv6).
Ran a speed test & it works. Perhaps it's not enough of a change to the original APN, but, I was able to select it.
I did find that once it's saved, to select another APN, you have to tap directly on the corresponding dot for the selected APN to change. If you just tap on it w/o tapping the dot, it won't select & just stay on whatever you're currently using.
No it's an unlocked OnePlus 8 bought from Amazon.
I believe though that carriers are requesting locked APNs or pushing them to the phone and is a problem since Android 10.
Another sim I tried from a different carrier is also locked.
Anyway your suggestions are appreciated.
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