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Repair and disassembly information for the Samsung Galaxy S21 5G Android smartphone, announced and released in January 2021.

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Why is my SIM card not working?

Hello All, I purchased my Samsung Galaxy S21 (unlocked) in December of 2021. I was overseas on vacation and removed my SIM card to not get random charges. When I returned my SIM card did not work. I got a new SIM card, no dice. Finally, I bought a new phone and put the SIM card in, it works! How can I start trying to repair the problem with my Samsung Galaxy S21 SIM card port or is there a software solution?

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My go to would be checking software… check it’s up-to-date, perform a hard reset etc. give it a fresh start. This then out-rules most software related problems, then I’d start to consider hardware. Does it give any errors, do you see No Service or No SIM?

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