“Phone not allowed” in Network settings but no SIM res
I have purchased an iPhone SE 2022 from eBay a little more than a week ago from a pretty popular seller (4000 rating or so). This phone has a carrier lock of no sim restrictions. I was using the carrier Red Pocket normally for a couple of days where suddenly the phone displays “SOS only” on the top. I have tried turning on/off airplane mode, resetting network settings, and powering off and on the phone, but to no avail. I have also checked my IMEI number on various websites and they say that the phone isn’t lost or stolen, and isn’t blacklisted. I have also tried my SIM on another iPhone and it works there. Since it is unlocked according to the phone, I don’t know what else to do. Should I factory reset my iPhone? Also, my phone is on the latest version of iOS. Please reach out to me asap as I have a couple of weeks left to refund my phone and if I should refund it. Thanks in advance.
iPhone 5, iOS 10