The phone was fine, I just had to power off the old one and then the new one started working as soon as I rebooted it. It's because Sprint doesn't just use the SIM for authentication on the network. Essentially, the old phone was still hanging onto the authorization on the CDMA side, and it had to release it for the new one to get it.
They shouldn't hassle you about a new SIM in a case like this. They just might not have the correct one for your phone in stock. So they may have to either order it, or they can maybe pull one from a used/returned phone in the back and put it on your account.
Also, double check that the IMEI or ESN that Sprint has on file for your line actually matches your phone.
Sent from my Pixel 2 XL using Tapatalk
100% sure I didn't mess anything else. Just the priorities.
You were right, it does lock me out if I don't do it fast enough, is very tricky to get it. I followed your procedure in safe mode and got the carrier reset message. After pressing yes, the phone rebooted but the behavior still persists. Another interesting bit is that as soon as I pop my Sprint SIM, wifi on the phone disconnects. If I remove the SIM, wifi functions normally (this behavior does not happens with any other SIM). The problem with this is that when I attempt to activate via SprintDM, it fails due to no wifi connection.
Did that phone ever worked again normally?
No other phones or lines. Just this one.
I guess I will have to do that. Hopefully, a new SIM should fix this strange issue.
Do they give the SIMs hassle free or are they difficult?
By the way, thanks for the advice.