- Phones and tablets
- Android phones and tablets
No SIM Card inserted
OnePlus No SIM Card inserted on phone: SIM read failure
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
On a OnePlus phone, being alerted with "No SIM Card inserted" (or "Invalid SIM" or "SIM Card cannot be detected") means the device cannot recognize the removable SIM card in the tray to access your mobile service.
Safety first
Stop and check this first
- Do not cut or resize a regular SIM or Micro-SIM on your own to fit a Nano-SIM slot: Nano-SIMs are slightly thicker than regular or Micro-SIMs, and cutting the card may damage both the chip in the SIM card and the SIM card slot.
- Before tapping Erase all data in Settings > System & update / Additional settings > Back up and reset > Reset phone, back up all important data because a factory data reset permanently erases all photos and personal data; if your phone is carrier locked through a monthly subscription, never use unofficial unlocking tools.
Safe checks you can perform
- Check that your SIM card enable switch is turned on in Settings
- Restart the phone, eject the SIM tray, inspect the card, and swap slots
- Insert the SIM card into another phone to see if the issue persists
- Update device software and reset after backing up your data if needed
Leave these tasks to a qualified professional
- Do not attempt this professional task: Contact your SIM provider or telecom operator for a SIM replacement
- Do not attempt this professional task: Contact OnePlus Customer Support for official phone and SIM slot service
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Contact your SIM provider or telecom operator for a SIM replacement
What they doIf the issue persists when the SIM is inserted into another phone, if the SIM card size does not fit the tray, or if the SIM and phone were permanently locked after entering the wrong PUK code ten times in a row, OnePlus advises bringing your card, device, and valid certificates to your SIM provider to reissue a new SIM card.
They must show youproper detection and network registration of the newly issued Nano-SIM card in your phone.
In writingthe SIM replacement or reissue confirmation from your mobile carrier.
Contact OnePlus Customer Support for official phone and SIM slot service
What they doIf the SIM issue is resolved when tested in another phone and the troubleshooting steps do not fix your OnePlus handset, find your IMEI by dialing *#06# or opening Settings > About device > Status > IMEI 1 (or checking the phone box) and contact OnePlus Customer Support.
They must show youthe diagnostic test of the SIM tray and internal SIM card reader on your OnePlus phone.
In writingthe OnePlus Support case number and service report referencing your device IMEI and Serial Number.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Check that your SIM card enable switch is turned on in Settings
- Who:
- you, in the Settings menu of your OnePlus phone.
- How:
- go to Settings > Mobile network > SIM and check if the enable switch for your SIM card is turned off; if it is off, tap it to turn it back on (for dual SIM, check that both SIMs are enabled).
- Result that matters:
- confirm that the SIM card is enabled in OxygenOS software settings.
- If turning the enable switch back on restores carrier signal:
- the SIM was simply disabled in settings.
- If the switch is already on or grayed out:
- restart the phone and inspect the physical SIM card.
- Evidence to keep:
- a screenshot of Settings > Mobile network > SIM showing the switch state.
Evidence: OnePlus Phone Doesn't Detect the SIM Card
Restart the phone, eject the SIM tray, inspect the card, and swap slots
- Who:
- you, using the ejector SIM tool key that came with your OnePlus phone.
- How:
- restart your phone by pressing and holding the Power and Volume Up or Down buttons for at least 8 seconds until you see the logo; then turn off the phone, remove the SIM tray with the ejector tool, check the SIM card for signs of damage, reinsert it properly, and swap SIM slots if your device has dual SIM.
- Result that matters:
- verify the SIM card has no visible damage and sits properly in either SIM slot.
- If reseating the card or swapping SIM slots resolves the alert:
- alignment or a single slot contact was the cause.
- If the phone still shows the alert in both slots:
- test the SIM card in another phone.
- Evidence to keep:
- which SIM slot you tested and whether the card or tray showed any visible damage.
Evidence: OnePlus Phone Doesn't Detect the SIM Card
Insert the SIM card into another phone to see if the issue persists
- Who:
- you, with a second compatible phone.
- How:
- insert your SIM card into another phone and check whether the recognition issue persists on that device, following OnePlus's official troubleshooting sequence.
- Result that matters:
- isolate whether the fault is with your SIM card or with your OnePlus phone.
- If the issue persists in the second phone:
- you need to contact your SIM provider for further assistance.
- If the issue is resolved in the second phone:
- the SIM card works, so update your OnePlus software or contact OnePlus Support.
- Evidence to keep:
- whether the second phone detected the SIM card and connected to the mobile network.
Evidence: OnePlus Phone Doesn't Detect the SIM Card
Update device software and reset after backing up your data if needed
- Who:
- you, when the SIM card works in another phone but not in your OnePlus device.
- How:
- update the software of your OnePlus device; if the issue persists, back up all important data first and go to Settings > System & update / Additional settings > Back up and reset > Reset phone to reset settings or erase all data.
- Result that matters:
- rule out a software or system configuration issue blocking SIM recognition.
- If the phone detects the SIM card after updating or resetting:
- a software glitch caused the error.
- If the alert remains even after updating and resetting:
- contact OnePlus Customer Support.
- Evidence to keep:
- your installed OxygenOS version and confirmation that your backup completed before resetting.
Evidence: OnePlus Phone Doesn't Detect the SIM Card · How to Factory Reset an OnePlus Phone
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Phones and tablets
- Brand
- OnePlus
- Product type
- Android phones and tablets
Known code variants
- Invalid SIM
- la tarjeta SIM No se puede detectar
- No se insertó la tarjeta SIM
- No se insertó la tarjeta SIM inváli
- OnePlus No SIM Card inserted
- SIM Card cannot be detected
What it means
The Subscriber Identification Module (SIM) reader and mobile network subsystem in OxygenOS read your removable SIM card to access your unique phone number, carrier information, and billing data. In its official guide "OnePlus Phone Doesn't Detect the SIM Card", OnePlus groups the on-screen alerts "No SIM Card inserted", "Invalid SIM", and "SIM Card cannot be detected" when the phone cannot recognize the card. Seeing this alert alone never proves that the internal SIM reader hardware is broken: a turned-off SIM enable switch in settings, an improperly seated or manually cut SIM card, a monthly subscription carrier lock, or outdated software can all cause it.
Warnings and stop conditions
- Highsource verified
Do not cut or resize a regular SIM or Micro-SIM on your own to fit a Nano-SIM slot: Nano-SIMs are slightly thicker than regular or Micro-SIMs, and cutting the card may damage both the chip in the SIM card and the SIM card slot.
Evidence: OnePlus Phone Doesn't Detect the SIM Card
- Highsource verified
Before tapping Erase all data in Settings > System & update / Additional settings > Back up and reset > Reset phone, back up all important data because a factory data reset permanently erases all photos and personal data; if your phone is carrier locked through a monthly subscription, never use unofficial unlocking tools.
Evidence: OnePlus Phone Doesn't Detect the SIM Card · How to Factory Reset an OnePlus Phone
Symptoms and causes
Probable causes · in order
- SIM card enable switch turned off in Settings or card not seated properlyCommon
OnePlus notes that if the enable switch under Settings > Mobile network > SIM is turned off or the SIM card is not inserted properly in the tray, the phone will not recognize it.
Evidence: OnePlus Phone Doesn't Detect the SIM Card
- Damaged, worn, or manually cut SIM cardCommon
OnePlus advises never cutting a regular or Micro-SIM on your own to fit a Nano-SIM slot because Nano-SIMs are slightly thicker and cutting can damage both the chip and the SIM slot.
Evidence: OnePlus Phone Doesn't Detect the SIM Card
- Outdated system software or carrier-locked monthly subscription phonePossible
System or software issues can block SIM recognition, and a phone purchased through a monthly carrier subscription may be carrier locked so it only accepts SIM cards from that carrier.
Evidence: OnePlus Phone Doesn't Detect the SIM Card · How to Factory Reset an OnePlus Phone
- Fault in the OnePlus phone SIM tray or internal SIM readerLess common
If the SIM issue is resolved when you insert your SIM card into another phone, the detection problem lies with the OnePlus handset rather than the SIM card.
Evidence: OnePlus Phone Doesn't Detect the SIM Card
Virtual technician
Does No SIM Card inserted still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
OnePlus Phone Doesn't Detect the SIM Card
OnePlus · 2025 · official_doc
- 2
El teléfono OnePlus no detecta la tarjeta SIM
OnePlus · 2025 · official_doc
- 3
How to Factory Reset an OnePlus Phone
OnePlus · 2025 · official_doc
- 4
¿Cómo restablecer la fábrica de un teléfono OnePlus
OnePlus · 2025 · official_doc
- 5
How to Find / Check the IMEI and SN on OnePlus Products
OnePlus · 2025 · official_doc
- 6
¿Cómo encontrar/comprobar el IMEI y el SN en los productos EU OnePlus
OnePlus · 2025 · official_doc
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