You can try the UICC Unlock on the phone. If it doesn't work, we'll have to submit a ticket. The tickets can take 2 business days.
I inserted an active sprint sim on Samsung J3, i tried UICC Unlock on the phone with same results: The profile update cannot be completed... Internal error 407
Also I tried update profile option and on step one registering the device with network I get: Please contact service provider.... Internal error (-1)
I can receive sms and make calls with device.
Ok, I'll submit an unlock ticket for you. The phone will need to keep the Sprint SIM in it, it needs to be powered on and connected to WiFi. Once it's set up, send me a private message with the phone's IMEI, your name, and your phone number.
Thank you. I have responded. Have a great day!
@mimi, I'm happy to help with the unlock. Was this phone on your Sprint account, or did you buy it from a Sprint customer?