iPhone Says No Service: A Step-by-Step Troubleshooting Guide

Categories screen for SIM, eSIM, network, and calling references
See the app on the App Store: Secret Codes: IMEI & Carrier

Secret Codes: IMEI & Carrier app icon

When an iPhone says No Service, the cause may be a local outage, weak coverage, SIM problem, account issue, network setting, or hardware fault. Start with reversible checks and avoid changing call-forwarding or network codes until you know what they do.

Start with the signal

Move outdoors or near a window, then ask whether another phone on the same carrier is affected. Turn Airplane Mode on for about 15 seconds and turn it off. Restart the iPhone and test a call, text, and mobile-data connection.

Check the active line

Open Settings > Cellular and confirm that the intended line is enabled. On Dual SIM iPhones, verify the default voice and data lines. For a physical SIM, power off the phone and check that the card is seated correctly. For an eSIM, do not delete the profile unless the carrier instructs you to.

Check for carrier updates

Open Settings > General > About and wait briefly for a carrier settings prompt. Install available iOS updates and confirm that your account is active. A number port, plan change, or unpaid balance can interrupt service even when the iPhone itself is healthy.

Use trusted carrier references

Download Secret Codes: IMEI & Carrier for verified references covering network, SIM, eSIM, voicemail, call forwarding, caller ID, and carrier-specific shortcuts. The app opens a selected code in the Phone dialler without automatically dialing it.

Know when it is hardware

If Wi-Fi, Bluetooth, cameras, or other sensors also fail, the problem may be physical damage. A diagnostic scan can organize checks for battery, thermals, display, microphone, speaker, sensors, and connectivity, but it cannot replace an inspection for liquid or impact damage.

Contact the carrier

Ask the carrier to check outages, provisioning, SIM status, device compatibility, and carrier lock. Give them the exact error message and IMEI privately. If the carrier confirms the line is healthy, contact Apple Support for device-level troubleshooting.

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