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sim card

  • 23 May 2023
  • 9 replies
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Just purchased a Samsung Galaxy s21, unlocked to any carrier. When it asks me to read sim card it's saying theres no sim card installed, which it is. Any suggestions?

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Best answer by gramps28 23 May 2023, 01:31

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Userlevel 7
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Is the SIM card the one from your old device?  If it is a new SIM.  Has the SIM card been activated by Customer Care or in a store?  

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It's a working card from old phone

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T-mobile is the carrier service for qlink wireless. Qlink wireless is who I'm under. I've used the simple card in two other phones w/out any issues

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Sim**

Userlevel 7
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Try contacting qlink wireless to see if it's something on their end.

Userlevel 7
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or depending on how old your prior devices were the sim cards might not be compatible.

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My Galaxy S21 would tell me there was "No SIM" a couple times every day. Restarting the phone was the only way to get it to "find" the SIM card. I have the "unlocked" version of the phone. I tried all the suggested fixes, and nothing worked. I tried a new SIM card, and that did not help either. Finally, I asked T-Mobile to switch me to the eSIM. That fixed the problem.

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so theres a chance your sim card holder or somewhere in that area has an issue.

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Could it be a problem with the SIM card holder in the phone?  Yes it could.  I do not think it is a physical problem, however, because when I restart the phone, the SIM is recognized just fine.  It also tended to lose connection to T-Mobile when I would drive to a new location.  My guess is that the problem is either some kind of strange glitch in the phone with the SIM card reading circuitry or that T-Mobile is not connecting properly to the phone since it is unlocked.  I know an unlocked phone should work fine on any compatible network, but I saw a comment where T-Mobile told someone that an unlocked phone may not be compatable on T-Mobile’s network.  I know my phone is unlocked because it does not start up with the T-Mobile logo.  It is a Samsung Galaxy S21 SM-G991U1.

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