Samsung Galaxy says No SIM card: fixes

howtosimply.com/guides/samsung-galaxy-says-no-sim-card-fixes/ · Checked October 2026 · Samsung Galaxy A57 5G (SM-A576B), One UI 8.5, Android 16

5 of 5 steps with real screenshots · 3 official sources below

Device

Android

Shown on

Samsung Galaxy A57 5G (SM-A576B), One UI 8.5, Android 16

Starts in

Quick Settings

Real screenshots

5 of 5 steps

What we did

Observed: looked at each screen, changed nothing

Our phone

Shown on Galaxy A57, One UI 8.5

Checked

October 2026

Sources

3 official, linked below

Step by step

1. 

   Check the status bar

   Pull down the quick panel. With a working SIM, the signal bars show at top right and the carrier name at top left. We blurred our carrier.

   Done

2. 

   Switch Airplane mode on and off

   Tap the plane button in the quick panel, wait a few seconds and tap it again. On our Galaxy, the expanded quick panel labels this button Airplane mode.

   Done

3. 

   Tap the power icon

   Tap the power icon at the top right of the quick panel, between the pencil and the settings cog.

   Done

4. 

   Tap Restart

   Tap Restart and wait for the phone to start again. On our Galaxy, the power menu also shows Power off, Emergency call and Medical info.

   Done

5. 

   Check SIM manager

   Open Settings, Connections, SIM manager and make sure the switch next to your SIM is on.

   On our Galaxy, SIM 1 is switched on and the empty second slot says No SIM card. We blurred the number.

   Done

If you do not see this option

• No Airplane mode label The quick panel first opens in a compact view with icons only. Swipe down again to expand it; on our Galaxy the plane button is then labelled Airplane mode.
• No power icon It sits at the top right of the quick panel, next to the settings cog. On our Galaxy it shows in both the compact and the expanded panel.
• No SIM manager Open Settings, then Connections; SIM manager is listed there on One UI 8. On older One UI versions a few names and positions differ.

If this does not work

• The SIM switch is off Tap the switch next to the SIM in SIM manager. On our Galaxy the switch is blue when it is on.
• SIM manager still says No SIM card The phone is not reading a SIM in that slot. Samsung suggests Settings, General management, Reset, Reset mobile network settings. Sources: What to do when the SIM card is not detected on your Samsung Galaxy device, SIM card is not detected on your Samsung Galaxy device, How to fix the No SIM Card Detected error on Samsung Galaxy devices
• Signal bars show but there is no service The SIM is being read, so this is a network problem rather than a SIM problem. See our guide to Samsung Galaxy says No service. Sources: What to do when the SIM card is not detected on your Samsung Galaxy device, SIM card is not detected on your Samsung Galaxy device, How to fix the No SIM Card Detected error on Samsung Galaxy devices

About this guide

No SIM card means the phone cannot read the SIM at all, which is different from No service (SIM read, but no network). The fix is usually in the SIM manager, not in the network settings.

The quick panel is see-through, so it looks lighter over the home screen than the dark Settings pages.

Good to know

If the phone still restarts into No SIM card, Samsung suggests Settings, General management, Reset, Reset mobile network settings.

If the phone reads the SIM but has no signal, see Samsung Galaxy says No service. Moving to an eSIM avoids a worn tray: how to add an eSIM on a Samsung Galaxy.

In short: Airplane mode on and off, restart from the power menu, then check the SIM is switched on in SIM manager.

📷 See real photos from the Galaxy A57 in our Camera Lab, next to 10 other phones.