iPhone Shows No Service After a SIM Change
Troubleshoot an iPhone that shows No Service after changing SIM cards, from basic checks to carrier support.
No Service can result from coverage, SIM provisioning, carrier settings, account restrictions or hardware problems. Work through simple checks before assuming the phone is locked.
Start with basic checks
Toggle Airplane Mode, restart the device, inspect the SIM tray and test the SIM in another compatible phone if possible. Check whether other devices have service in the same location.
Check carrier and settings
Install available iOS updates and carrier settings updates. Ask the carrier to confirm the line is active and the SIM is provisioned correctly.
When to seek help
If the issue persists with multiple known-good SIMs, contact Apple or an authorised repair provider. A carrier lock or blacklist question should be confirmed with the relevant carrier.
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Review available services and requirements before placing an order. Only request services for devices you own or are authorised to manage.