Comprehensive guide to resolving the SIM 1 not allowed on Samsung S21.
I was excited to get my hands on the dual-SIM Galaxy S21 smartphone. Everything was going smoothly.
Suddenly, my mobile internet connection started to drop for a few minutes at odd periods, which was quite inconvenient. So, I tried to find a way of coming across a solution. To make matters worse, the error notice “SIM 1 Not Allowed” began to appear, and my SIM card was no longer connected to the network. Fortunately, it still worked in the SIM 2 slot.
I executed some research and tried a lot of solutions to fix the Sim 1 Not Allowed on Samsung S21 issue.
Finally, I discovered some successful solutions!
So, I thought I’d share my experience and solutions with all of you.
If your Samsung S21 shows a “SIM 1 Not Allowed” error message, this indicates that its SIM card may be defective. The error could be due to several factors including blocked SIMs or carriers locking one of its slots (this could happen if you bought your phone from AT&T, Verizon, or T-Mobile who lock one SIM slot to ensure their services instead of switching).
Software glitches, hardware failures, or accidentally modified settings could also present themselves as issues on some phones; users who aren’t the original owners may also run into difficulty paying their payments on time or are otherwise responsible.
Although this issue may appear complex, it’s easy to address.
Checking your SIM card, network coverage, and device restart are among the many steps that could help resolve it as are updating software on your phone and contacting carriers to unblock SIM.
If none of these alternatives work, you can take your phone to a Samsung service center for assistance.
First, double-check your SIM card by inserting and verifying it properly in another phone, making sure it hasn’t been damaged or broken. If it has, contact your carrier immediately so a new card can be issued if required; or just take it out and insert it into another device to see if damage exists.
If your SIM card hasn’t any issue, you could check the network coverage in your location. This error may occur if your device is not receiving a strong network signal. Contact your network provider or use their coverage map to check network coverage.
This error message is sometimes generated by a software problem. In this situation, restarting your phone may assist in resolving the issue.
To restart your Samsung S22,
Resetting your Galaxy S21’s network settings can frequently resolve this issue by restoring all configurations to their default condition.
Note: This process will clear away all current settings, including saved Wi-Fi networks and Bluetooth pairings
To restore your network settings, follow these steps:
Once completed, switch off the device. Insert a SIM card in SIM 1 of your phone to test if this solution has helped resolve any problems that have arisen.
There’s always the risk that your Samsung phone is using an outdated software version, so be sure to check for updates regularly. Otherwise, serious problems could ensue should it not run the latest software version.
To check software updates, follow these steps:
One of the primary sources of this issue is a blacklisted IMEI. Before taking steps to unblock it on your Samsung S21, ensure that its SIM 1 slot IMEI has not been blocked first by checking its IMEI status. Here’s how you can do it.
After this step is complete, you should access any database website to search your IMEI number.
Follow these steps for identifying a mobile device’s IMEI status:
If your smartphone was purchased from a carrier, customer service can verify whether its SIM slot has been blocked and unblock it so you can use any SIM card in that slot without issue.
If none of the above solutions worked, your Galaxy S21 most likely has a hardware failure.
To test this, do not perform any actions such as resetting the device or emptying the cache. Go to the nearest Samsung service center as soon as possible. Then leave the problem to the specialists.
Have you fixed the “Sim 1 Not Allowed” bug on your Samsung S21? Share your success story or any other helpful tips in the comments! Your experience could be the solution that someone else is looking for.
If you need any assistance with this guide or have any queries, feel free to leave a comment below and we are more than happy to assist you.
Let’s troubleshoot together!
While that might impact older Android phones and gadgets like Kindles, SIM card faults on contemporary Samsung phones are probably caused by configuration problems. The first thing users should do if their Samsung phone displays the “Sim 1 Not Allowed” issue is to make sure their SIM card is inserted correctly.
It’s possible that the SIM card is filthy or broken, or that you did not put it in the tray properly.
Take the subsequent actions:
If nothing resolves, get in touch with your network provider.
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