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S10+ (G975F) IMEI status NG and fails to join GSM network.

(Topic created: 06-16-2023 06:24 AM)
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jerseypete
Constellation
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Galaxy S Phones

Hello,
I recently purchased an unlocked S10+ because I wanted to install a custom ROM on it.
One of the prerequisites for the install is a firmware upgrade to the latest Android 12 version.
I got the firmware for the phone's CSC and flashed it successfully with odin4 on Linux.
However, the phone will not join T-Mobile's network, even though the APN network is correct in connection settings. 
Checking the SIM/RF stack via *#0011# shows valid RF signal, but IMEI Status reports as NG.
The phone works flawlessly over WiFi (VoWiFi, etc...), but reports emergency calls only when WiFi is disabled.

I'm wondering if someone could suggest other things for me to try with the phone to get it connected to the GSM network.

Many thanks.

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Samsung_Moderator
Community Manager
Community Manager
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Galaxy S Phones

I apologize, but you have reached technical support for products manufactured for usage in the United States. Please visit https://www.samsung.com/us/common/visitlocationsite.html to find your country's support page.

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Samsung_Moderator
Community Manager
Community Manager
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Galaxy S Phones

I apologize, but you have reached technical support for products manufactured for usage in the United States. Please visit https://www.samsung.com/us/common/visitlocationsite.html to find your country's support page.