iPhone shows Invalid SIM or No SIM
Invalid SIMCheck the plan, carrier lock and settings before handling a physical SIM or deleting an eSIM.
Try this first
1 quick checks · ~3 min
Find your situation
See all the clues. Choose the one that matches what you observe.
It began after changing SIM, carrier or activating a line
Confirm the plan, activation and carrier lock before blaming the reader. An incompatible SIM is not a valid hardware test.
A previously working physical SIM is no longer recognized
Separate contact/tray problems from the card or provisioning through a compatible comparison. Do not force the tray or cut another SIM.
The affected line is eSIM or one of two lines
Identify which line is missing or shows the alert. The other line working does not confirm this one finished activating.
Diagnostic signals
- ObservationThe line appears but shows SOS or No Service
- That changes the question from SIM reading to registration/coverage. Use the related guide if there is no longer a SIM alert; do not manipulate the tray for missing coverage.
Step-by-step solutions
Identify the alert, line and SIM type
Identify the line before touching its card, activation or settings.
Record which line is affected, whether it appears and whether it is physical or eSIM. With two lines, check outside a call to avoid confusing availability during a call with an absent SIM.
- Settings
- Cellular
Keep the exact wording and whether it began after changing carrier, transferring eSIM, updating or with no known change. If the line appears and only coverage is missing, follow SOS/No Service; if No SIM/Invalid SIM persists, continue by SIM type.
Confirm activation and carrier compatibility
Contact the carrier through another channel if needed and confirm the plan is active and the change/transfer completed. A pending line is not repaired by repeatedly reseating the card.
“No SIM restrictions” indicates no carrier lock. If locked to another carrier, only the appropriate carrier can handle unlocking; do not use bypass services.
- Settings
- General
- About
- Carrier Lock
In About, accept a carrier settings update if officially offered. Once activation is confirmed, save what you are doing and restart normally once. If the alert disappears, verify the line and stop; if it remains, use the physical or eSIM branch.
Resolve an eSIM without deleting its profile
If the eSIM line appears disabled, turn it on only if it is yours and should be in service. If missing after a transfer or activation never completes, ask the carrier to verify that activation; do not reuse codes or repeatedly transfer it.
With two lines, report which fails and which works. That narrows the scope but does not prove an iPhone fault or rule out a carrier problem affecting one line. If both fail, report it without deleting either profile.
If the carrier confirms correct activation and plan and the alert persists after a normal restart, request its next check or referral to Apple. Stop before deleting the eSIM: it may require new activation and leave you without service.
Advanced checks
Continue if the earlier steps did not help. Read each procedure’s precautions first.
Check a physical card and make a compatible comparison
Only if the model has a SIM tray and you can operate it without force, remove and reseat the card according to Apple. Check that the tray belongs to that model and closes correctly; a loose or damaged tray needs service, not more pressure.
If the alert remains, the carrier can provide another active compatible SIM for testing. Use one from the same carrier if locked; an incompatible card does not distinguish reader and card. Do not cut cards or use improvised adapters.
If the other SIM works here, the iPhone can read at least that card: ask the carrier to inspect or replace the original. If the original also fails in another compatible phone, that strengthens this path without proving whether the card or its provisioning is at fault.
If the original works elsewhere and no compatible SIM is recognized here, give Apple the results and tray condition. If you lack a valid comparison, ask the carrier to perform it; do not buy or manipulate parts to complete the test.
Still not working?
Escalate with the exact alert, affected line, SIM type, confirmed activation/lock and valid comparisons performed. The carrier handles provisioning or card replacement; Apple handles possible reader/tray problems after those variables are addressed. Do not delete eSIMs, reset the phone or repeat ejections without a new hypothesis.
Sources
Documentation behind this guide. Editorial recommendations are identified separately.
- Apple SupportOfficialIf you see invalid SIM or no SIM on your iPhone or iPad
- Apple SupportOfficialIf you see SOS, No Service or Searching on your iPhone
- Apple SupportOfficialUsing Dual SIM with an eSIM
Source review: . A documentation review, not a physical hardware test.