Mobile Network Not Available? Check Service Before Resetting Your Phone

For an emergency in the United States, try calling 911 before troubleshooting. An iPhone showing SOS or SOS only can make emergency calls through other carrier networks; that is different from ordinary service being available. Do not call 911 to test connectivity or report a routine outage. (Apple, FCC)

Otherwise, check that Airplane mode is off, restart your phone once, then check with your carrier for an outage. “Mobile network not available” is not, by itself, proof that your phone is broken or that the whole network is down. Carrier service, coverage, settings and SIM problems can require different fixes.

Reviewed October 25, 2026. This is a troubleshooting guide, not a live outage report.

Start with the checks that do not erase anything

1. Check Airplane/Flight mode. Make sure it is off. On iPhone, Apple recommends turning it on for at least 15 seconds, then off, to try reconnecting.
2. Restart once. Both Samsung and Apple recommend restarting for cellular connection problems.
3. Try a better location, if safe. Move closer to a window or outside; avoid underground parking areas. During a storm, do not leave safe shelter just to find a signal.

These steps follow Samsung’s signal troubleshooting and Apple’s no-service guidance.

Next, use working Wi-Fi or another phone to contact your carrier. Ask it to check local outages, coverage, account status, whether your device is blocked and whether it has the right data plan. Those are separate checks in Apple’s guidance—not problems a restart necessarily fixes. (Apple)

Use nearby phones as clues, not a definitive outage test:

What you observe	What to check next
Several nearby phones on the same carrier lose service	Check that carrier’s outage information or support first.
Another phone on your carrier works beside yours	Prioritize your line, SIM and phone settings.
Service returns near a window or outside	Investigate local coverage before resetting settings.

For carrier-specific help, see T-Mobile troubleshooting or Verizon SOS-mode checks.

If only your phone is affected

Check the active SIM or eSIM line. On a dual-SIM iPhone, open Settings → Cellular → your line and confirm Turn On This Line is enabled. If the line is missing, contact your carrier. Do not delete the eSIM as an outage experiment. (Apple)

On Samsung Galaxy devices, check Settings → Connections → SIM manager. Under Connections → Mobile networks → Network operators, use Select automatically if your carrier exposes that option. Menus vary by model, software and region. (Samsung)

If the carrier rules out an outage or account problem, a mobile-network reset may be a later step. On supported Galaxy models, Samsung lists Settings → General management → Reset → Reset mobile network settings, separately from the Wi-Fi/Bluetooth reset. Read the confirmation screen; do not choose a factory reset during an unresolved outage. (Samsung)

If service still does not return after these checks, contact your carrier or the phone manufacturer rather than repeating resets. Apple recommends device service if the carrier finds no account or network issue and a hardware problem is suspected. (Apple)

Stay reachable while the power is out

• Try Wi-Fi Calling over working internet. It requires carrier/device support and may require an emergency-service address. A Wi-Fi connection alone is not enough: T-Mobile explicitly requires internet access. If home internet is also down, use the no-internet troubleshooting guide. (Apple, T-Mobile)
• Try a short text for non-emergency check-ins. Texts may get through when calls fail during congestion, but can be delayed. This is not a guarantee when cellular service is unavailable. (FCC)
• Space failed call attempts at least 10 seconds apart. Dim the screen and limit nonessential use to preserve battery. Keep a battery-powered radio available for emergency information if phone connectivity remains unreliable. (FCC emergency communications guidance)