If your Nothing Phone (3) shows a "Not registered on network" error or has no signal bars, you can't make calls, send texts, or use mobile data. This usually means your phone is having trouble authenticating with your carrier's cell towers. Before you assume the worst, there are several straightforward steps you can take to get back online.
Start with the simplest fixes first. A quick restart or toggling Airplane Mode can often resolve temporary glitches. I'd try those before moving on to anything more involved. The goal is to force your phone to re-establish a clean connection with the network.
Restart Your Nothing Phone (3)
Hold the power button and tap "Restart" on your screen. This gives the phone's modem a fresh start and clears out any temporary software bugs that might be interfering with network registration. Wait for the phone to fully boot up and see if your signal returns.
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 about 10 seconds, then tap it again to turn it off. This cycle forces the cellular radio to disconnect and reconnect, which can re-establish the network handshake without a full reboot.
Check and Reinsert Your SIM Card
Power off your Nothing Phone (3) 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. Log into your carrier's website or app from another device to check your account status. An unpaid bill, expired prepaid plan, or a carrier-side provisioning error can all cause the "not registered" message. It's a quick thing to rule out.
Reset Your Network Settings
This clears all saved Wi-Fi networks, Bluetooth pairings, and cellular configurations. It's a clean slate for your network hardware. On your Nothing Phone (3), go to Settings > System > Reset options > Reset Wi-Fi, mobile & Bluetooth. Confirm the reset and let your phone restart. You'll need to reconnect to Wi-Fi networks afterward.
Manually Select Your Network Operator
Your phone might be trying to latch onto a weak or incompatible tower. You can force it to search for and pick your carrier manually. Go to Settings > Network & internet > SIMs > Network operators. Turn off "Choose automatically," wait for the list to populate, then select your carrier's name from the list.
Change the Preferred Network Type
If you're in an area with spotty 5G, forcing your phone to use LTE can provide a more stable connection. Navigate to Settings > Network & internet > SIMs > Preferred network type. Try switching from "5G" to "LTE" or even "3G/2G" temporarily to see if your phone registers. If it works on a lower band, it's likely a coverage issue.
Update Nothing OS
Software updates frequently include fixes for connectivity bugs and modem improvements. Make sure your Nothing Phone (3) is running the latest version of Nothing OS. Go to Settings > System > System update and tap "Check for update." If an update is available, install it and restart your phone.
Try a Different SIM Card
This test tells you if the problem is with your SIM or the phone itself. Borrow a known-working SIM card from a friend (on any carrier) and insert it into your Nothing Phone (3). If the new SIM connects to a network, 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 your phone.
Perform a Factory Reset
This is your last resort before considering a hardware issue. A factory reset will erase all data on your phone, so back up everything important first. On your Nothing Phone (3), go to Settings > System > Reset options > Erase all data (factory reset). After the reset, set up the phone as new without restoring a backup immediately to test the network connection. If the error remains after a clean setup, there may be a problem with the phone's internal antenna or modem.
