How to clean a SIM card and SIM tray on iPhone

A dirty SIM card is a less common cause of No SIM or No Service than people think, but it does happen, especially after a drop or if the card has been in a pocket of lint for years. Cleaning is quick and costs nothing. Do it carefully, because the gold contacts scratch easily.

What not to use

• Sandpaper, erasers or anything rough. They scratch the gold contacts and can stop the SIM from working for good.
• Water, soap or cleaning sprays.
• Metal tools in the slot. They can damage the pins inside the iPhone.
• Compressed air blown straight into the slot, which can push dust further in.

For stubborn residue, a cloth that is barely damp with isopropyl alcohol is usually the limit, and the card must dry fully before it goes back in.

Still says No SIM? Test the SIM

If the card is the problem, ask your carrier for a new one. It is usually cheap or free, and keeps your number. For other causes, see an iPhone with no service.

No SIM tray on your iPhone?

In the US, iPhone 14 and later use eSIM only and have no tray, so there is nothing to clean. If your eSIM stops working, contact your carrier and see what an eSIM is and how it works. To take a physical SIM out safely, read how to remove a SIM card.

Signs your SIM or tray needs attention

Look for messages such as No SIM, Invalid SIM or SIM Failure, signal that comes and goes, or calls that drop when you move the phone. These can come from dirt or corrosion on the SIM contacts, a bent tray or a SIM that is not seated. They can also come from the carrier or a software problem, so clean first, then test, then look at the network.

Remove, inspect and refit the SIM step by step

Turn the iPhone off. Push the SIM ejector tool, or a straightened paper clip, into the small hole in the tray and pull the tray out. Take out the SIM by its edges and avoid touching the gold contacts with your fingers. Look for scratches, dents or green or dark residue. Wipe the contacts gently with a dry, lint-free cloth, check the tray for dust, and put the SIM back the same way it came out. Push the tray in fully, turn the iPhone on, and wait a minute for signal. Our guide to how to remove a SIM card shows where the tray is on each model.

Cleaning the tray slot safely

Dust can sit inside the slot. Use a dry, soft brush or a dry cotton swab on the outside of the opening. Apple advises against compressed air for cleaning an iPhone, and you should not blow into the port with your mouth. Do not push anything sharp into the slot, because the contacts inside are delicate.

If it still says No SIM

Try the SIM in another phone, or another SIM in your iPhone, to learn which one is faulty. If the SIM fails in both phones, ask your carrier for a free or low cost replacement. If another SIM works in your iPhone but yours does not, the carrier side is the problem. See an iPhone with no service and a SIM that is PIN locked for the next checks, or switch to a digital line as described in what an eSIM is and how it works.

How often should you clean it?

You do not need to clean a SIM on a schedule. Only do it when you see a SIM error or after you have dropped the phone or it got wet. Constantly removing the tray wears the seal that keeps dust and water out, so open it only when you need to. If the same SIM stops working again within a few weeks, replace it instead of cleaning it again.