How to Fix No SIM Card Detected on Android

By ErrorFix · Updated October 16, 2026 · 6 min read

What “No SIM card detected” means

When Android says “No SIM card detected,” it means something simpler — and harsher — than most SIM errors: as far as the phone is concerned, there is no SIM in it at all. Not an unactivated one, not a mis-seated one — nothing. The SIM reader checked the tray and found no card to talk to. That is why the status bar often drops to “Emergency calls only” and why there is no carrier name, no signal bars, and no mobile data: the phone cannot even begin the conversation with your carrier.

Almost always, this comes down to contact. The SIM reader talks to the card through the tiny gold pads on the card meeting spring pins inside the reader. Anything that breaks that contact — a card shifted a millimeter out of place, dirty or oxidized pads, a bent tray, dust or lint in the reader — makes the card invisible to the phone. Less often, the card itself has died, or the phone’s SIM reader has failed. Either way, the fix is mechanical before it is anything else.

The distinction that saves you time: this error is about detection, not activation. “SIM not provisioned” means the phone sees the card but the network rejects it; “No SIM card detected” means the phone sees nothing at all. So don’t start by calling your carrier — start with the tray. Work through the steps below in order: the first three take about ten minutes and isolate the problem, and steps 4 and 5 tell you definitively whether the card or the phone is broken.

Common causes

• SIM card shifted in the tray: even a millimeter of movement breaks the contact between the card’s gold pads and the reader pins — this is the number-one cause.
• Dirty or oxidized contacts: fingerprints, dust, or corrosion on the card’s gold pads block the electrical connection.
• Bent or damaged SIM tray: a tray bent from drops or rough ejector use no longer holds the card flat against the reader.
• Faulty or dead SIM card: cards can simply fail, especially after years of use or many tray insertions and removals.
• SIM reader hardware failure: less common, but the phone’s own reader can break — usually after a hard drop or water exposure.

How to fix “No SIM card detected” — step by step

Start with steps 1 through 3 — they’re quick, and reseating the card fixes this more often than anything else.

1. Restart the phone with the SIM inserted. Press and hold the Power button, tap Restart, and let the phone boot fully before checking the status bar. A fresh boot forces the phone to rescan the SIM tray, and it clears temporary modem glitches that can make a perfectly good SIM invisible. This simple restart fixes the error more often than people expect, so never skip it.
2. Eject the tray and reseat the SIM card. Power the phone off completely — don’t just sleep it. Push the SIM ejector tool into the tray hole and pull the tray straight out. Lift the card and set it back into its cutout so it sits perfectly flat and level, then push the tray fully in until it clicks and power the phone on. A card shifted even slightly out of place loses contact with the reader pins, and the reseat alone restores detection.
3. Clean the SIM contacts and inspect the tray. Wipe the card’s gold pads gently with a dry, soft cloth to remove fingerprints, dust, or oxidation — keep them dry and don’t scratch. Hold the tray up and look along its edge for bends or cracks, and give the empty tray slot a short puff of air to clear lint. A bent tray holds the card at an angle so it never presses against the reader pins; bent trays need replacing, not straightening.
4. Test the SIM in another phone. Borrow another phone and insert the same SIM, then power it on. If the card is detected there, your SIM is fine and the problem is your phone’s tray or reader — continue to step 5. If the SIM isn’t detected in the other phone either, the card itself is dead or faulty: skip ahead to step 6 for a replacement.
5. Try a different SIM in your phone. Borrow a working SIM — any carrier will do — and insert it into your phone. If your phone detects it, your SIM reader is healthy and your own card is the problem: get a replacement. If your phone detects no card at all even with a known-good SIM, the phone’s SIM reader or tray hardware has failed, and this is where troubleshooting ends and a repair shop begins.
6. Reset network settings and get a replacement SIM. On stock Android go to Settings > System > Reset options > Reset Wi-Fi, mobile & Bluetooth; on Samsung go to Settings > General management > Reset > Reset network settings. This costs you nothing but saved Wi-Fi passwords — your apps, photos, and accounts are untouched. If the card still isn’t detected after all of this, visit your carrier with ID for a replacement SIM — replacements are often free and they confirm in seconds whether the old card was the fault.

Did this fix it? Quick checklist

• The “No SIM card detected” message is gone and the phone shows your carrier name
• You can make and receive calls and send texts
• Mobile data works (test by loading a page with Wi-Fi turned off)
• The SIM stays detected after a restart — the fix survived a reboot

If the error comes back after every restart, look at the tray itself: trays that work when you press on them but fail when you let go are bent and need replacing. And if the card worked in another phone but yours detects nothing — even a borrowed SIM — don’t keep fighting it; the reader hardware is broken and a technician is cheaper than another round of resets.