If your POCO F6 shows a "Not registered on network" error, you're stuck without calls, texts, or mobile data. This happens when your phone can't properly identify itself to your carrier's cell towers. Before you worry about a hardware problem, there are several straightforward fixes you can try, often right from your phone's settings.
Start with the simplest solutions first. A quick restart or toggling Airplane Mode can clear temporary glitches that block the network registration process. I'd start with these, as they take less than a minute and solve the issue more often than you'd think.
Restart Your POCO F6
Hold down the power button until the power menu appears, then tap Restart. Let the phone boot up completely. This forces the modem to reinitialize and attempt a fresh connection to the network, which can clear up minor software hiccups.
Toggle Airplane Mode
Swipe down from the top of your screen to open the Quick Settings panel. Tap the Airplane Mode icon to turn it on, wait for about 10 seconds, then tap it again to turn it off. This cycle resets all the phone's wireless radios, including the cellular modem, prompting it to search for and register on the network again.
Check and Reinsert Your SIM Card
Power off your POCO F6 completely. Use the SIM ejector tool to pop out the SIM tray. Carefully remove the SIM card, inspect it for any visible damage or dirt, and gently blow on the card and the tray slot. Reinsert the SIM, making sure it's seated correctly in the tray, and push the tray firmly back into the phone. Power it back on.
Verify Your Carrier Account Status
Sometimes the issue is with your service, not your phone. An unpaid bill, an expired prepaid plan, or account suspension will prevent registration. Try logging into your carrier's website or app from another device, or give them a quick call from a different phone to confirm your line is active and in good standing.
Reset Your Network Settings
This clears all saved network configurations, which can resolve conflicts causing the registration error. Go to Settings > Connection & sharing > Reset Wi-Fi, mobile networks and Bluetooth. Tap the reset option and confirm. Your phone will restart, and you'll need to re-enter Wi-Fi passwords and re-pair Bluetooth devices, but it often fixes persistent cellular issues.
Manually Select Your Network Operator
Your phone might be trying to latch onto a weak or incompatible tower. Go to Settings > SIM cards & mobile networks. Tap your active SIM, then tap Network operators. Turn off "Select automatically," wait for the list to populate, and manually choose your carrier's network from the list. This can force a more stable connection.
Change the Preferred Network Type
If you're in an area with spotty 5G, forcing your phone to use LTE might help. In the same SIM cards & mobile networks menu for your SIM, tap Preferred network type. Try switching from "5G/LTE/3G/2G" to just "LTE/3G/2G." This can provide a more reliable registration on a stronger, more consistent signal band.
Update Your Phone's Software
Xiaomi and POCO release updates that fix known bugs, including network-related ones. Make sure your POCO F6 is running the latest version of HyperOS. Go to Settings > About phone > HyperOS version and tap the "Check for updates" button. If an update is available, install it and restart your phone.
Clear the Phone Services Cache
A corrupted cache in the system services that handle calls can cause this error. Go to Settings > Apps > Manage apps. Tap the three-dot menu, select "Show all apps," and find "Phone Services" in the list. Tap on it, then go to Storage & cache > Clear cache. This doesn't delete any personal data, just temporary files.
Test With a Different SIM Card
This helps pinpoint whether the problem is with your SIM or the phone itself. Borrow a working SIM card from a friend (from any carrier) and insert it into your POCO F6. If the new SIM registers on the network without issue, your original SIM card is likely faulty and you need a replacement from your carrier. If the new SIM also fails, the issue is with the phone.
Perform a Factory Reset
This is your last resort before considering a hardware repair. A factory reset will erase all data on your phone, so back up everything important first. Go to Settings > About phone > Factory reset. Follow the prompts to erase all data. After the phone reboots and you go through the setup, test with your SIM card immediately before restoring your apps and data.
