How To Fix Samsung Galaxy No Service Or Signal Problems (2026)

Your Samsung Galaxy shows “No service”, has no signal bars, or keeps dropping calls and mobile data.

The cause is usually a setting, a SIM problem or a software glitch, and not a dead phone.

Try these fixes in order, and most take under two minutes each.

Samsung no service: quick answer

Symptom	Likely cause	Fix to try first
No service, no bars	Airplane mode or SIM issue	Turn off Airplane mode, reseat SIM
Bars but calls drop	Network settings glitch	Reset mobile network settings
Calls and texts fine, no data	APN settings	Reset APN to default
Incoming calls never ring	Unknown callers blocked	Turn off Block calls from unknown numbers
Signal only in some places	Network mode or coverage	Change Network mode

What order should you try the fixes in?

Fix 1: turn off Airplane mode

Samsung notes that with Airplane mode on, calls and network connections are unavailable.

1. Open Settings > Connections.
2. Switch Airplane mode off.
3. If it was already off, switch it on for 15 seconds, then off again.

Fix 2: restart the phone

A restart re-registers the phone on the network and clears many temporary glitches.

Power the phone off, wait about 30 seconds, then turn it back on and give it a minute or two to find the network.

Fix 3: check for a software update

Go to Settings > Software update > Check for updates and install anything offered.

Use Wi-Fi for the download, because mobile data may not be working.

Some Samsung pages name the button Download and install instead of Check for updates, so look for either.

If the signal problem began right after an update, see how to fix Galaxy S26 mobile data after an update.

Fix 4: is the SIM card the problem?

Power off, remove the SIM with the ejector pin, check it for damage, and reinsert it firmly.

If you have a spare working SIM, test it, because a working spare points to a faulty original.

A damaged SIM needs replacing through your carrier.

Wipe the SIM and the tray with a clean, dry cloth, and handle the tray gently so it does not bend or break.

If a second phone also fails to detect the SIM, the SIM is probably damaged, so ask your provider for a replacement.

Not detected at all? Read how to fix a Samsung Galaxy SIM card not detected.

Fix 5: how do you change the network mode?

Samsung says the selected mode may not connect properly depending on your location or carrier.

1. Open Settings > Connections > Mobile networks.
2. Tap Network mode.
3. Try each available mode and check the connection after each change.

Why are incoming calls not ringing?

Samsung lists blocked unknown callers as a cause when incoming calls do not come through.

1. Open the Phone app.
2. Tap More options (three dots), then Settings > Block numbers.
3. Turn off Block calls from unknown numbers.

Related: Galaxy S25 not receiving calls.

Fix 6: reset mobile network settings

Use this when calls keep disconnecting or the signal keeps dropping.

1. Open Settings > General management > Reset.
2. Tap Reset mobile network settings.
3. Tap Reset settings, then Reset.

Restart the phone afterward and test again.

Warning: this clears all mobile network settings and cannot be undone, so you may need to re-enter any settings your carrier requires.

Fix 7: reset APN settings if data will not work

Samsung says incorrect Access Point Name settings can stop the phone from connecting to the network.

1. Open Settings > Connections > Mobile networks > Access Point Names.
2. Tap More options (three vertical dots).
3. Tap Reset to default, then Reset.

Warning: do not type in custom APN values unless your carrier gave them to you.

Fix 8: run Samsung Members diagnostics

If nothing worked, test the radio hardware from the Samsung Members app.

1. Open Samsung Members.
2. Tap Support > Get Started.
3. Select Mobile network and follow the prompts.

This is available only on phones that have Samsung Members installed.

To save time, stop the full scan and run only the Mobile network test.

Is it your carrier account or outage?

Check that your plan is active and paid, since a suspended line shows as no service.

Also ask your carrier whether there is an outage or a tower issue in your area before resetting anything further.

What causes no service on a Galaxy?

• Coverage: poor signal or a network outage, so move to a better-covered area and watch the bars in the top-right corner.
• SIM: a faulty or badly seated SIM.
• Software: outdated software or carrier settings.
• Settings: Airplane mode, wrong network settings or call blocking.
• Account: a carrier account or service problem.

What other checks does Samsung list?

• Phone app cache: Samsung suggests clearing it, though its page gives no menu path.
• Wi-Fi Calling: test with it if your phone offers it, to see whether calls work without the mobile signal.
• Network bands: confirm the phone supports your carrier’s bands, which matters most for imported phones.
• Carrier APN settings: check them against what your carrier specifies.

When should you call your carrier instead of Samsung?

• You recently switched carriers and have not activated the phone.
• Your account is suspended or restricted.
• The problem continues after every step above.

Samsung says carriers handle activation, network programming and outages.

What if it still shows no service?

Ongoing failure after diagnostics points to the SIM, the carrier account or the phone’s hardware.

Contact your carrier first, then Samsung support if the carrier confirms the line is fine.

Samsung documents these steps on its call disconnections and no network signal page and a matching Samsung Australia guide, and menu names may vary by model.

Checked against Samsung support in November 2026.

How do you check warranty before a repair?

1. Open samsung.com/us/support/warranty.
2. Choose the Phones, Tablets and Wearables category.
3. Enter your model number and either the serial number or the IMEI.

Samsung’s page lists a 1-year limited warranty for smartphones, and you can reach support through chat at samsung.com/us/support/contact or the Samsung Members app.