SIM 1 not allowed error: what it means and how to fix it

A common issue when setting up a Smartphone for the first time such as the new Galaxy S22 and S22 Ultra is a ‘SIM not allowed’ error. While SIM card errors with older phones can be an unavoidable problem, modern issues with these errors should be easy to fix with some light troubleshooting. Major phone companies are ending their 3G network support, leaving older devices without cellular data. While this may affect older Android phones and devices like Kindles, modern Samsung phones are likely to experience SIM card errors due to configuration issues.

The hassle that comes with SIM cards may not bother users for much longer. eSIM technology, which allows users to connect to cellular services without a physical SIM card installed, is common in modern smartphones. Furthermore, eSIM may even be replaced with new technologies in the future as companies are testing the iSIM technology. This is a smaller version of an eSIM chip that is integrated directly into the smartphone’s motherboard or system-on-a-chip (SoC). However, these new iterations of SIM card technology can also be the cause of the ‘SIM 1 not allowed’ error on the latest Samsung smartphones.

Users who are facing ‘SIM 1 not allowed’ error should first check if the SIM card is installed correctly. The location of the SIM card slot varies by smartphone model, but the tray can be identified by the small hole used to eject the tray. Using a SIM ejector tool or an unrolled paper clip, users can easily eject the SIM tray and verify that the SIM card is installed correctly. The problem can also be caused by an incompatible SIM card as there are different size standards for different phones. To find specific details on how to properly install a particular device, refer to the quick start guide included with your smartphone or contact the mobile operator that supplied the SIM card.

Discrepancies in phone settings can also be the cause of SIM card errors on Android smartphones. Specifically, if a phone is configured to use an eSIM or a physical SIM it can cause the error “SIM 1 not allowed”. an eSIM, which does not require a physical SIM card, it will reject any physical SIM card installed in the first SIM card slot. To check this, open the settings app and navigate to mobile settings. Here, users will be able to see if the phone is configured to use an eSIM or physical SIM and is installed correctly. If it’s configured for an eSIM, just change the configuration to recognize the physical SIM card. In some cases, this may require you to contact your mobile carrier.

To use cellular services on any network, phones are assigned an IMEI number that identifies the device. This is used when reporting a phone as lost or stolen and if the “SIM 1 not allowed” error persists then it could be due to a blacklisted IMEI number. To verify this, there are many databases online that can be used to check the status of an IMEI number. If the phone was recently purchased used, it could be lost or stolen, which would prevent the phone from activating over a cellular network. However, if the phone was recently purchased as new, it is likely that the designation was made in error. For errors with IMEI numbers or persistent ‘SIM 1 not allowed’ errors, please contact the original point of purchase or the mobile carrier supporting the Smartphone.

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