When Android says No SIM, SIM card not detected, Insert SIM, or SIM not available, the fastest way to diagnose it is to find out whether the problem follows the SIM card or stays with the phone.
That distinction matters because a bad SIM, a damaged tray, a disabled SIM profile, carrier provisioning, and an eSIM problem all need different fixes.
Start with the simplest test.
Test the SIM in Another Phone
If you use a physical SIM, remove it and test it in another compatible phone.
If the SIM works in another phone
The SIM itself is probably fine.
Focus on:
- the SIM tray;
- the phone’s SIM reader;
- Android network settings;
- software;
- carrier compatibility.
If the SIM also fails in another phone
The SIM is more likely to be:
- damaged;
- inactive;
- deactivated;
- no longer supported;
- incorrectly provisioned.
Contact your carrier before doing anything drastic to the Android phone.
Google also recommends inspecting a physical SIM for damage or bending when troubleshooting SIM detection on Pixel devices.
Check Whether Android Sees the SIM at All
Before changing settings, see whether the phone recognizes the SIM profile.
On Pixel:
Settings > Network & internet > SIMs
If the carrier is shown but disabled, turn on Use SIM.
If the carrier name appears greyed out with No SIM, Android is not currently detecting an active SIM.
On Samsung Galaxy:
Settings > About phone > Status information > SIM card status
Samsung says the Network field should show the carrier when the SIM is being recognized properly.
This check separates a true detection problem from a situation where the SIM is detected but mobile service is failing.
Restart the Phone Once
Restart Android before changing network settings.
A temporary modem or system process can occasionally fail to initialize the SIM correctly.
After restarting, wait a minute for the phone to reconnect to the carrier.
If No SIM remains, continue.
Remove and Reinsert the Physical SIM
Power the phone off.
Use the SIM eject tool to open the tray.
Then:
- Remove the SIM.
- Check its orientation.
- Inspect the contacts.
- Check the tray for cracks or warping.
- Reinsert the SIM flat in the tray.
- Push the tray in fully.
- Restart the phone.
Do not force the tray.
Google recommends replacing a SIM that is visibly damaged or bent.
Samsung also lists incorrect insertion and physical SIM damage among the main reasons a Galaxy phone may stop detecting a SIM.
Clean the SIM and Tray Carefully
Dust or debris can interfere with the contacts.
Use a dry microfiber cloth to wipe the SIM gently.
Do not use:
- water;
- cleaning fluid;
- metal tools;
- abrasive material.
If debris is visible inside the SIM slot, do not push a pin or other metal object into the phone.
If the tray or slot looks damaged, have it inspected.
If the Phone Uses eSIM
An eSIM problem needs a different approach because there is no physical card to reseat.
On Pixel:
Settings > Network & internet > SIMs
Check whether the eSIM profile exists and whether Use SIM is enabled.
If you are setting up a new eSIM:
Settings > Network & internet > SIMs > Add SIM > Set up an eSIM
Google notes that an eSIM may need to be activated by the carrier before the phone can detect or use it properly.
If eSIM setup or transfer repeatedly fails, contact the carrier.
Do not delete an existing eSIM profile casually. Depending on the carrier, you may need a new activation code or carrier assistance to reinstall it.
Pixel 10 and Newer U.S. Models: Check Whether You Actually Need eSIM
Google currently notes that U.S. Pixel 10-series phones and later U.S. Pixel models use eSIM rather than a physical SIM.
That matters if you moved a physical nano-SIM from an older phone and expected the new Pixel to detect it.
The solution is not to keep reinserting the card.
You need to activate an eSIM through the carrier.
Google also notes that some older physical SIM cards are unsupported on Pixel 8 and later devices, in which case the carrier may need to issue a replacement.
Turn Airplane Mode On and Off
If the SIM appears in Settings but the phone has not connected to the network, toggle Airplane Mode.
- Turn Airplane Mode on.
- Wait about 20 to 30 seconds.
- Turn it off.
- Give the phone time to reconnect.
This refreshes the radio connection.
It is more useful when the SIM is already detected but the network is not registering.
It is less useful when Android says there is physically No SIM.
Check Whether the SIM Is Disabled
Dual-SIM phones can keep a SIM profile installed while disabling it.
On Pixel:
Settings > Network & internet > SIMs
Select the SIM and make sure:
Use SIM is on.
Samsung and other manufacturers provide similar SIM manager controls.
This is especially worth checking after:
- switching eSIMs;
- setting up dual SIM;
- changing the default data SIM;
- transferring service from another phone.
If You See “SIM Not Provisioned” or “SIM Not Activated”
That is usually a carrier issue rather than a physical detection problem.
The phone may see the SIM but the network has not activated it properly.
Common causes include:
- a new SIM not fully activated;
- number transfer still in progress;
- account suspension;
- carrier provisioning error;
- eSIM activation failure.
Contact the carrier and ask them to verify:
- SIM status;
- account status;
- IMEI compatibility;
- activation;
- provisioning.
Do not factory-reset the phone for a provisioning error.
If You See “Emergency Calls Only”
Emergency calls only is also different from No SIM.
The phone may recognize the SIM but fail to register normally with the carrier.
Possible causes include:
- weak or unavailable coverage;
- carrier outage;
- inactive account;
- roaming restrictions;
- incompatible network;
- provisioning issues.
Try moving to an area with better signal and check whether another phone on the same carrier has service.
If calls or texts are the only things failing, see Not Receiving Text Messages on Android for message-specific troubleshooting.
Install Android Updates
If the SIM stopped working after a software change, check for another update.
On most Android phones:
Settings > System > Software update
or the manufacturer’s equivalent.
Install any available system and security updates, then restart.
Do not assume every post-update SIM problem is software, though.
If the SIM also fails in another phone, the update is not the cause.
If several apps became unstable after the same update, see Apps Keep Crashing After Android Update.
Reset Mobile Network Settings
If the SIM is detected but Android still cannot connect properly, reset the mobile network settings.
On current Pixel phones:
Settings > System > Reset options > Reset mobile network settings
Google documents this as a mobile-connectivity troubleshooting option.
Other Android manufacturers use slightly different menu names.
Read the confirmation screen first.
A network reset can remove or reset:
- mobile network preferences;
- APN-related configuration;
- Wi-Fi settings on some phones;
- Bluetooth settings on some phones.
The exact scope varies by manufacturer.
This is why I would use it after checking the SIM, not before.
Check Carrier Compatibility
A SIM can be perfectly healthy and still fail to work normally in an incompatible or locked device.
Check whether:
- the phone is carrier-locked;
- the carrier supports the phone model;
- the carrier supports the required network bands;
- the IMEI is accepted;
- the SIM type is supported.
Google notes that Pixel phones can be SIM-locked depending on where they were purchased, and that not every Pixel model supports every 5G network.
If a new carrier SIM fails immediately after switching networks, carrier compatibility is more likely than a random Android setting.
When the SIM Tray or Reader Is Probably the Problem
Hardware becomes more likely when:
- the SIM works in another phone;
- multiple known-good SIM cards fail in this phone;
- the tray is cracked or bent;
- detection changes when pressure is applied to the tray;
- the phone was recently dropped;
- the phone had liquid exposure;
- the SIM disappears intermittently.
Do not keep bending the tray or inserting extra material to force contact.
That can damage the reader.
A repair technician may need to inspect the tray, SIM reader, or motherboard connection.
When to Replace the SIM
Replace the physical SIM when:
- it is cracked;
- it is bent;
- the contacts are badly worn;
- it fails in more than one phone;
- the carrier confirms it is obsolete or unsupported.
Google currently notes that some older SIM cards are not supported on newer Pixel phones.
A carrier can normally move your existing number and plan to a replacement SIM.
Do Not Factory-Reset the Phone Too Early
A factory reset is rarely the first answer to a SIM detection problem.
Do not reset the phone when the evidence already points to:
- a damaged SIM;
- an inactive account;
- carrier provisioning;
- an unsupported physical SIM;
- a damaged tray;
- eSIM activation.
A factory reset cannot repair hardware or activate a carrier account.
Only consider it after the SIM works elsewhere, the phone hardware looks normal, network settings have been reset, software is updated, and the carrier has ruled out provisioning.
