Mobile Network Not Available on Android usually means your phone cannot register with your carrier, so calls, texts, and mobile data may all stop. The message looks simple, but the cause could be weak coverage, a missing SIM profile, a rejected network registration, an account restriction, or a phone radio fault. The fastest solution is to identify which part of that connection is failing before changing settings.
This guide uses the phone’s actual test results to narrow the problem. Menu names differ slightly among Google Pixel, Samsung Galaxy, Motorola, OnePlus, and other Android phones, but the same diagnostic logic applies.
First, identify the type of network failure
Check the status bar, then open Settings > Network & internet > SIMs or Settings > Connections > SIM manager. What you see determines the right path:
- The phone says No SIM or does not list the eSIM: Android is not detecting the subscriber identity. Start with the SIM or eSIM section below.
- Your carrier appears, but the phone will not connect: the network is visible, but registration is being rejected. Check activation, account status, carrier lock, and provisioning.
- No carriers appear during a manual search: the phone may be outside coverage, using an incompatible network mode, or experiencing a radio or antenna problem.
- Calls and texts work, but internet access does not: the phone is already registered. Use the separate guide for mobile data not working on Android because APN and data settings are more likely than network registration.
Before deeper testing, turn Airplane mode on for about 15 seconds, turn it off, and wait up to two minutes. Then restart the phone once. These two actions force the cellular radio to reconnect without erasing any settings.
If the phone cannot find any carrier
Open the manual network search screen. On many phones, it is under Settings > Network & internet > SIMs > Automatically select network. On Samsung phones, look under Settings > Connections > Mobile networks > Network operators. Turn automatic selection off temporarily and scan.
No networks appear in the scan
Move outdoors or to another location before assuming the phone is defective. Elevators, basements, concrete buildings, rural areas, and local tower maintenance can leave the phone with no usable signal. Compare it with another phone on the same carrier in the same place. If both phones fail, the carrier or local coverage is the likely cause.
Next, confirm that the preferred network type includes a standard your carrier supports. Choose the broad automatic option, such as 5G/LTE/3G/2G (auto connect), rather than forcing 5G only, LTE only, or an older technology. A forced mode can prevent registration where that particular service is unavailable.
If no carrier appears in several known-good coverage areas, continue to the cross-test section. That result is more useful than repeatedly toggling settings.
Your carrier appears in the scan
Select it once. A successful connection suggests automatic network selection was stuck. Turn automatic selection back on afterward so the phone can change towers normally.
If Android reports that it cannot connect, the phone can hear the network but is not being accepted. That points away from basic coverage and toward the SIM, account, carrier lock, roaming permission, or device identity.
If the carrier rejects registration
Registration can fail even when signal bars or a carrier name appear. Work through these checks based on what recently changed.
Confirm that the line is active
Use your carrier’s app or website over Wi-Fi, or contact the carrier from another phone. Confirm that the line is active, the bill is current, and there is no outage or suspension. For a newly activated line, ask whether the SIM or eSIM ICCID is attached to the correct phone number and whether provisioning has completed.
If you recently moved the line to a different phone, the carrier may also need the new device IMEI. You can usually find it under Settings > About phone. Do not post the IMEI publicly.
Check for a carrier lock
A phone locked to one carrier may detect another carrier’s SIM but refuse to register. This is especially common with used phones and devices moved between countries. Check the unlock status with the carrier that originally sold the phone. A factory reset does not remove a carrier lock.
Consider roaming and regional compatibility
If the error started while traveling, make sure international roaming is enabled on the account, not only on the phone. A phone imported from another region may also lack the frequency bands or carrier certification needed for reliable service. The carrier can confirm whether the exact model number is supported.
If Android does not detect the SIM or eSIM
For a physical SIM
Power the phone off before removing the SIM tray. Check that the card is seated in the correct orientation, the tray is not bent, and the gold contacts are clean and dry. Reinsert the tray fully, turn the phone on, and give it a minute to register.
If Android still shows No SIM, follow the more specific checks in SIM card not detected on Android. A detection failure must be solved before network selection or APN changes can help.
For an eSIM
Open the SIM manager and verify that the eSIM profile is present and enabled. If the profile disappeared after a reset, repair, or phone transfer, contact the carrier for a replacement activation method. Do not delete an existing eSIM just to troubleshoot unless the carrier confirms that it can be downloaded again.
For dual-SIM phones
Disable the second line temporarily and test the affected line by itself. Confirm that the correct SIM is enabled for calls and mobile data. If the phone has two physical slots, moving the same SIM to the other slot can reveal a damaged tray contact or slot.
Cross-test the SIM and phone
A controlled swap can separate a carrier problem from a handset problem. Use a known-working, compatible phone and SIM when possible, and record each result:
- Your SIM fails in two phones: the SIM, line activation, or carrier account is the likely problem. Ask the carrier to reprovision the line or replace the SIM.
- Another active SIM works in your phone: your phone radio is probably functional. Focus on your original SIM and account.
- No working SIM can register in your phone: check software and reset network settings, then consider hardware service.
- Your SIM works in another phone but not yours: look for a carrier lock, incompatible model, damaged SIM slot, or cellular hardware fault.
This test is more decisive than changing APN values. APN settings control mobile data after registration; they normally do not fix a phone that cannot register for calls or texts.
Install updates before resetting network settings
Connect to Wi-Fi, charge the phone, and install pending Android system updates. Manufacturers sometimes include modem firmware and carrier configuration changes in system updates. Restart after installation and test a call before making further changes.
If the problem remains, reset only the mobile network settings:
- Google Pixel and similar Android phones: Settings > System > Reset options > Reset mobile network settings.
- Samsung Galaxy: Settings > General management > Reset > Reset mobile network settings.
The wording varies by model. Review the confirmation screen because some phones combine Wi-Fi, Bluetooth, and mobile settings in one reset. This action can remove saved network preferences and may require you to reselect options, but it does not erase photos or apps.
A full factory reset is not an appropriate early step. It will not activate a suspended line, unlock a carrier-locked phone, restore a damaged SIM, or repair a broken antenna.
Know when the message points to hardware
Hardware becomes more likely when every known-working SIM fails in the phone, no networks appear in multiple strong-coverage locations, or the problem began after a drop, water exposure, screen replacement, or other repair. An intermittent signal that changes when the phone is flexed or handled can also indicate an antenna connection problem.
Check Settings > About phone. If the IMEI is missing or shown as unknown, or the baseband version is unavailable, stop changing network settings. Back up important data and arrange diagnosis with the manufacturer or a qualified repair provider.
Do not confuse this error with nearby problems
If the status bar specifically says Emergency Calls Only, the phone can see a cellular network but has not gained normal subscriber service. That message has overlapping causes, but its emergency-access state deserves a separate check.
If normal calls work but Wi-Fi calling fails indoors, troubleshoot Wi-Fi calling on Android instead. If only one contact or one calling app fails, the mobile network itself may not be the cause.
What to do after the tests
Contact the carrier when the SIM fails in another phone, the carrier appears but rejects registration, the line was recently activated or transferred, or the account may be restricted. Tell support the exact cross-test results so they can check activation, provisioning, the ICCID, and the IMEI without repeating basic steps.
Arrange phone service when multiple known-working SIMs fail, manual search finds no carriers in confirmed coverage, or the IMEI or baseband information is missing. Those results isolate the handset more clearly than the error message alone.
