Seeing a "No SIM card" or "Insert SIM card" message on your Sony Xperia 1 VI can stop you from making calls or using mobile data right when you need it. This is a common Android headache, but it's usually something you can fix yourself with a few simple checks.
Start With a Quick Restart
Before you do anything complicated, try a simple restart. Press and hold the Power button until the power menu pops up, then tap "Restart." This clears out temporary software glitches that can sometimes confuse the phone's SIM card reader.
If the phone is completely frozen and won't show the menu, you'll need to force restart it. Press and hold the Power button and the Volume Up button together for about 10 seconds. Keep holding until you feel the phone vibrate and see the Sony logo appear.
Check the SIM Card Tray and Contacts
This is often the culprit. First, power off your Xperia 1 VI completely. Find the SIM ejector tool that came in the box (a small paperclip works too) and gently push it into the tiny hole on the SIM tray to pop it out.
Take a close look at the SIM card itself. Check the gold contacts for any scratches, dirt, or discoloration. Gently wipe them with a clean, dry microfiber cloth. Also, peek inside the empty SIM slot on the phone for any dust or debris that might be blocking the connection.
When reinserting, make sure the SIM card is seated correctly in the tray. The notch on the card should align with the notch in the tray. Push the tray back in until it clicks firmly into place. A loose or misaligned tray is a common reason for detection failures.
Toggle Airplane Mode and Verify SIM Status
Swipe down from the top of your screen twice to open the full Quick Settings panel. Tap the Airplane Mode icon to turn it on, wait about 10 seconds, then tap it again to turn it off. This forces your phone's radio to reconnect to the network from scratch.
Next, verify the SIM is actually enabled in your settings. Go to Settings > Network & internet > SIMs. Here, you should see your SIM card listed. Make sure the switch next to it is turned on. You can also tap on the SIM name to see more details about its status and connection.
Update Your Phone's Software
Since the Xperia 1 VI runs Android 14, it's important to have the latest system update. Sony does release patches that can fix connectivity bugs. Go to Settings > System > Software update and tap "Check for update."
If an update is available, download and install it. I'd recommend doing this while connected to Wi-Fi. After the update finishes, your phone will restart, which often clears up lingering software issues that might be affecting the SIM card.
Reset Your Network Settings
If the problem persists, resetting network settings can help. This clears out all your saved Wi-Fi networks, Bluetooth pairings, and mobile network configurations without touching your personal photos, apps, or messages.
To do this, navigate to Settings > System > Reset options. Tap on "Reset Wi-Fi, mobile & Bluetooth." Confirm your choice, and the phone will reset and reboot. After it comes back on, you'll need to reconnect to Wi-Fi and re-pair Bluetooth devices, but it's a solid step for network-related glitches.
Check and Reset APN Settings
Incorrect Access Point Name (APN) settings can prevent your SIM from connecting to your carrier's data network, which sometimes manifests as a detection issue. Go to Settings > Network & internet > SIMs > Access Point Names.
You should see a list of APNs. Tap the three-dot menu in the top right and select "Reset to default." This will load the standard settings for your carrier. If you had to enter custom APN details before, you may need to re-enter them after this reset. Your carrier's website or support team can provide the correct information.
Try Manual Network Selection
Letting your phone automatically pick a network is usually best, but sometimes the process gets stuck. You can manually select your carrier to force a connection. Go to Settings > Network & internet > SIMs > Network operators.
Tap "Search networks" and wait for the list to populate. Then, select your specific carrier's name from the list (e.g., "T-Mobile" instead of "T-Mobile LTE"). The phone will attempt to register on that network. If it fails, you know the issue might be with network coverage in your area.
Test the SIM Card in Another Phone
This is the best way to figure out if the problem is with your SIM card or with the Xperia 1 VI itself. Power off another compatible phone, insert your SIM card, and turn it back on.
If the other phone also fails to detect the SIM, then the SIM card itself is likely faulty or deactivated. You'll need to contact your mobile carrier for a replacement SIM. They can usually activate a new one for you quickly.
Consider Using an eSIM
The Sony Xperia 1 VI supports eSIM technology. If your physical SIM card seems problematic or your carrier supports it, switching to an eSIM is a great permanent solution. An eSIM is a digital profile downloaded to your phone, so there's no physical card to get dirty, bent, or damaged.
Contact your carrier and ask if they support eSIM activation for your plan. They'll guide you through scanning a QR code or entering details manually in Settings > Network & internet > SIMs > Add eSIM.
Perform a Factory Reset
This is a last resort for software issues, but it can work. A factory reset will erase all data from your phone and return it to its original out-of-the-box state. You must back up everything important first using Google Drive, Sony's backup tool, or by manually transferring files to a computer.
To proceed, go to Settings > System > Reset options > Erase all data (factory reset). Follow the prompts to confirm. After the reset is complete, set up the phone as new and test the SIM card before restoring your backup, to see if the problem is resolved on a clean system.