Seeing a "No SIM card detected" message on your Fairphone 5 can stop you from making calls or using mobile data. This is a common Android issue, but the good news is the modular design of the Fairphone makes some hardware checks easier than on other phones.
I'd start with the simplest fix first, which often clears up temporary glitches.
Restart Your Fairphone 5
Hold down the Power button until the power menu appears on screen. Tap "Restart" and let the phone reboot. If the screen is unresponsive, you can perform a force restart by pressing and holding the Power button for over 10 seconds until the device vibrates and powers back on.
This basic step refreshes the phone's software and can resolve many temporary communication errors with the SIM card.
Check and Reinsert the SIM Card
One advantage of the Fairphone 5 is its user-repairable design. Power the phone off completely. Use the included SIM eject tool to open the tray on the side of the phone.
Carefully remove the SIM card and inspect the gold contacts for any dirt, scratches, or corrosion. Gently wipe them with a clean, dry microfiber cloth. Also, take a quick look inside the SIM tray slot for any debris.
Reinsert the SIM card, ensuring it's seated correctly in the tray, and push the tray back in until it clicks. Power the phone back on. This physical reseat solves a lot of detection problems.
Toggle Airplane Mode
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 cycle forces your phone's radio to disconnect and reconnect to the network, which can clear up a stuck connection state. You should see the network signal bars reappear if it works.
Verify the SIM is Enabled in Settings
Sometimes a SIM can be switched off in software. Open your Settings app and go to Network & internet.
Tap on SIMs. You should see your SIM card listed here. Make sure the toggle next to it is switched on. You can also tap on the SIM entry to check its specific settings and status.
Check for Software Updates
Fairphone is committed to long-term support, and a software bug could be the culprit. Keeping your phone updated is key. Go to Settings > System > System update.
Tap "Check for update." If an update is available, download and install it. The phone will restart. I've seen updates specifically address network and connectivity issues on various Android devices.
Reset Your Network Settings
This will erase all your saved Wi-Fi networks, Bluetooth pairings, and mobile network settings, but it won't touch your personal data like photos or messages. It's a strong step for persistent network issues.
Go to Settings > System > Reset options. Tap on Reset Wi-Fi, mobile & Bluetooth and confirm your choice. After the reset, you'll need to reconnect to Wi-Fi and re-pair Bluetooth devices.
Try Your SIM Card in Another Phone
This test tells you if the problem is with the SIM card itself or with your Fairphone 5. If you have access to another unlocked phone, power it off and insert your Fairphone's SIM card.
Turn that phone on. If it also fails to detect the SIM or get a signal, the issue is almost certainly with the SIM card. You'll need to contact your mobile carrier for a replacement SIM, which they usually provide for free or a small fee.
Check the Access Point Name (APN)
Incorrect APN settings can prevent mobile data from working and sometimes cause broader detection issues. Go to Settings > Network & internet > SIMs.
Tap on your active SIM, then select Access Point Names. If the list is empty or the settings look wrong, you'll need the correct APN from your carrier. You can usually find these on your carrier's website under "bring your own device" or "manual internet settings."
Tap the + icon to add a new APN, enter the details exactly as provided by your carrier, save it, and select it as the active APN.
Manually Select a Network Operator
Your phone usually does this automatically, but sometimes it gets stuck. Go to Settings > Network & internet > SIMs and tap your SIM.
Look for an option like Network operators or Carrier. Tap it, then tap Search networks. After a moment, a list of available carriers will appear. Select your own carrier's name from the list. The phone will attempt to register on that network manually.
Consider a Factory Reset
This is a last resort for software-related problems. A factory reset will erase all data on your phone, so you must back up everything important first. Use Google's backup service or manually transfer files to a computer.
Once backed up, go to Settings > System > Reset options. Tap Erase all data (factory reset) and follow the prompts. After the reset, set up the phone as new and test the SIM card before restoring your data.
