Everything seems fine, yet the SIM shows "No Service"? Check these settings.

If your phone suddenly displays "No Service"—stopping calls, messages, or mobile data—and the network is missing despite the SIM being inserted correctly, the SIM itself might not be faulty. Find out the real reason behind this.

When a phone suddenly shows "No Service" and stops handling calls, messages, or mobile data, one might immediately assume there is an issue with the SIM or the network; however, that isn't always the case. Often, the SIM is inserted correctly and there are no visible hardware faults, yet the network connection drops.

In such situations, there is no need to repeatedly remove the SIM or rush to get a new one. Simple checks and basic setting adjustments can often resolve this issue. Let’s look at which settings to check if your SIM is showing "No Service" despite everything appearing normal.

First, check Airplane Mode.

Sometimes, Airplane Mode is accidentally left on, cutting off the mobile connection. Start by turning it off and checking for a network signal. If it is already off, try turning it on for about 10–15 seconds and then turning it off again. This prompts the phone to attempt reconnecting to the mobile network.

Which settings to check if the SIM shows "No Service"?

If your phone isn't automatically connecting to the correct mobile network, check the "Automatic Network Selection" setting. Go to your phone's Settings and open the "Network & Internet" or "Mobile Network" option. Verify whether the automatic network selection setting is enabled. Also, check the "Network Mode" setting and ensure it is set to the standard option; an incorrect network mode can disrupt connectivity.

Try switching from 5G to 4G.

In areas with weak or unstable 5G coverage, the phone may constantly switch between 5G and 4G networks. Try changing the "Preferred Network Type" to 4G/LTE for a while to see if that resolves the issue. If the signal stabilizes, the issue might be related to network switching.

Try reinserting the SIM card

Turn off the phone, remove the SIM card, and check for dust, scratches, or any visible damage. Place the SIM card correctly in the tray and restart the phone. If you are using an eSIM, you can try toggling the SIM line off and then on again in the settings. If other methods fail, you can reset the network settings. This will remove saved Wi-Fi networks, Bluetooth connections, and mobile network settings, but it will not delete your apps, photos, or personal data.

Try restarting the phone

Sometimes, network connectivity issues can arise due to temporary software glitches. Restarting the phone is a simple solution in such cases. Allow the phone some time to reconnect to the network after it restarts. Therefore, rather than immediately deciding to replace the SIM card when you see a "No Service" alert, it is better to check these basic settings first.