How to Fix "No Service" on iPhone

By ErrorFix · Updated October 14, 2026 · 5 min read

What "No Service" means

When your iPhone's status bar shows "No Service" instead of your carrier's name and signal bars, the phone has lost contact with your carrier's cellular network. Calls, SMS messages, and cellular data stop working entirely. Everything else — Wi-Fi, Bluetooth, apps, the camera — keeps working normally, which is why the error can be confusing: the phone looks fine, it just refuses to talk to a cell tower.

Do not confuse "No Service" with its cousins. "Searching" means the phone is actively hunting for a network and may find one. "SOS" or "SOS only" on newer iPhones means the phone can reach emergency networks but cannot register on your carrier — often a sign the carrier account or line itself is the problem. True "No Service" is usually local to your phone: a stale registration, a SIM issue, or a settings problem. The exception is a carrier outage, where a tower failure knocks out service for everyone in an area and no phone-side fix can help. Because the fix steps take only a few minutes, always rule out the phone-side causes first before queuing on hold with your carrier.

Common causes

• Stale network registration: the phone's session with the tower gets stuck, especially after traveling between coverage areas or after an iOS update.
• Outdated carrier settings: your carrier pushes configuration updates separately from iOS; an old version can block the phone from registering after the carrier changes its network.
• Loose, damaged, or deactivated SIM: a SIM that shifted in its tray, a scratched card, or a line your carrier deactivated all produce No Service.
• iOS baseband bugs: some iOS releases ship with modem bugs that break network registration until Apple patches them.
• Carrier-side problems: an unpaid bill, a suspended account, or a tower outage in your area blocks service no matter what you do on the phone.

How to fix "No Service" — step by step

Work through these in order. Steps 1 and 2 alone reconnect most iPhones showing No Service.

1. Toggle Airplane Mode and restart Open Control Center and switch Airplane Mode on, wait about 15 seconds, then switch it off so the phone re-registers on the network. If No Service remains, force-restart the phone: quickly press Volume Up, quickly press Volume Down, then press and hold the Side button until the Apple logo appears. This clears a stale network registration, which is the most common cause.
2. Check for a carrier settings update Connect to Wi-Fi, then open Settings, General, About. If your carrier has pushed new settings, an update prompt appears within about 30 seconds — tap Update. Carrier settings control how the phone talks to your carrier's network, and an outdated version can leave the phone unable to connect after a network change.
3. Reseat the physical SIM or re-enable the eSIM Power the phone off, remove the SIM tray with an ejector tool, check the SIM for damage, reinsert it firmly, and power back on. For eSIM, go to Settings, Cellular, tap the line, switch it off, wait a few seconds, and switch it back on. A loose SIM or a deactivated line produces No Service even when everything else is fine.
4. Check for an iOS update Go to Settings, General, Software Update and install any available update. Some iOS versions have known modem or baseband bugs that break network registration, and Apple fixes them in later point releases. Install over Wi-Fi with the phone charged above 50 percent.
5. Reset network settings Open Settings, General, Transfer or Reset iPhone, tap Reset, then choose Reset Network Settings and enter your passcode. This wipes saved Wi-Fi passwords, cellular settings, and VPN configurations, forcing the phone to rebuild its network setup from scratch. You will need to rejoin Wi-Fi networks afterwards.
6. Check for a carrier outage and test the SIM Check your carrier's outage map or status page — a tower outage causes No Service for everyone in the area and no phone-side fix helps. If there is no outage, move the SIM to another unlocked phone: if it works there, the problem is your iPhone; if it fails there too, ask your carrier for a replacement SIM.

Did this fix it? Quick checklist

• The status bar shows your carrier name and signal bars instead of "No Service"
• You can place a test call and send a text message over cellular
• Cellular data loads a page with Wi-Fi turned off
• A carrier settings update was applied or confirmed current in Settings → General → About

If No Service persists after all six steps, the issue is almost certainly on the carrier side or in hardware. Contact your carrier and confirm the account is active and in good standing, and ask them to re-provision the line — they can reset your network registration from their end. If you are traveling, confirm the phone supports your carrier's current network bands; a phone that only supports older bands shows No Service where newer-only towers stand. As a final hardware check, inspect the SIM tray contacts for corrosion and try a brand-new SIM from your carrier — if a fresh SIM also shows No Service, the phone's cellular radio may need service at an Apple Store or authorized provider.