iOS · iPhone & iPad
Fix 'No SIM' or 'Invalid SIM' on iPhone
Source-checked About 10 minutes
Answer
Confirm the carrier plan is active, install carrier and iOS updates, reseat a physical SIM, or contact the carrier about eSIM and replacement.
Check the account and outage
Confirm the line is active and the carrier has no outage or account block.
Update carrier settings
Connect to Wi-Fi, open Settings > General > About, and install any carrier settings or iOS update offered.
Check the SIM
Restart; for a physical SIM, remove and reseat the correct tray without forcing it. For eSIM, contact the carrier before deleting it.
Test carrier hardware
Try another valid SIM only when supported and contact the carrier or Apple if the alert persists.
Video walkthrough
If it does not work
- If “Fix 'No SIM' or 'Invalid SIM' on iPhone” remains unresolved, identify the first numbered step that produces a different result and preserve that screen, file, or message. Recheck the specific account, permission, storage, connection, source-media, or device prerequisite above, then follow only the matching Apple Support recovery path; do not combine unrelated resets, bypasses, unofficial installers, or third-party repair tools.
Sources and verification
Checked against official documentation on . Scope: iPhone & iPad.
Follow the linked first-party guidance if labels differ after a platform or app update.