Question Verizon S21 Ultra Locked and not unlocking

[hoorrus]

Are you using this phone with Verizon service? From info you provided, your phone thinks you are using Sprint. It's a SPR CSC. You need to change the CSC to VZW. You need to bring the phone back to it's original state for any attempt of the unlock "processing".

Thank you for your guidance. I changed the CSC back to VZW. Here's what I see now:
Baseband: G991USQS6EWD5
Service provider version: SAOMC_SM-G991U_OYN_VZW_13_0019 VZW/VZW,VZW/VZW
CSC version : SAOMC_SM-G991U_OYN_VZW_13_0019

What steps should I take after that?

 

[yygemmi770]

Thank you for your guidance. I changed the CSC back to VZW. Here's what I see now:
Baseband: G991USQS6EWD5
Service provider version: SAOMC_SM-G991U_OYN_VZW_13_0019 VZW/VZW,VZW/VZW
CSC version : SAOMC_SM-G991U_OYN_VZW_13_0019

What steps should I take after that?

After that, if the phone is connected to WiFi, the unlock should process. However, if it does not work, I would suggest a Factory Data Reset. Yes, a factory data reset is not ideal, however, I have seen times where it was necessary for the unlock to process.

Try putting in a SIM from another provider with service and see what happens.

 

[hoorrus]

I tried a phone reset based and connected to the Wi-Fi. I still get the same message that the device can't be activated on another carrier's network. Anything else I can try?

 

[Winner X]

Does your device boot up Verizon and have all the Verizon apps?

Hello, I have the same device with the same model and it does boot up verizon and also have the verizon app. Have tried using an unlock code from unlockriver but did not work because i don't get the pop up to input unlock code whenever i insert an unsupported sim. How do i go about unlocking the phone

 

[Winner X]

I can confirm this works on my s21+ that was on verizon network, and was supposedly networked unlocked. Service carrier software said vzw/vzw, vzw/vzw. Tried to switch to tmobile with no luck with sim card swap. 5 minutes, error message about cannot which carriers, please call Verizon. Was on SM-996U1. So I tried to flash to SM-996U1 TMB, then SM-996U1 VZW, then, SM-996U1 XAA. No luck. Then I flashed, hesitantly, with SM-996U VZW . I thought that would put all verizons bloatware on it. Reseted phone and it did put all verizon bloatware on it. Then the magic! I installed my new tmobile sim, and a message appeared and asked if I wished to switch carriers. YES!!! phone rebooted to tmobiles network with no verizon errors. I checked service carrier software and it was TMB/TMB, VZW/VZW. I flashed phone again to SM-996U1 XAA. I rebooted and service carrier software was TMB/TMB, TMB/VZW! I then checked for software update, took update, and all it good! Thanks for all the information here. Took me days to find it and understand it and try it!!

Hello, please am having the same problem but mine is already on SM-G996U and the service carrier software is saying vzw/vzw, vzw/vzw and still locked. Any idea on what I should do