An Android phone with no network can be very frustrating, especially when you need to make calls, send SMS, use mobile data, receive OTPs, use WhatsApp, do mobile banking or communicate with customers. Sometimes the phone may show “No Service,” “Emergency Calls Only,” “No SIM,” “Mobile Network Not Available,” or network bars appear but the internet does not work.
This problem can be simple, such as airplane mode being on, SIM card not seated properly, data bundle finished, wrong APN or incorrect network mode. But it can also be serious, such as lost IMEI, damaged SIM slot, carrier-locked phone, network hardware problem or a provider outage in your area.
The first step is checking whether the issue affects calls, SMS or internet only. If you cannot make calls at all, the problem may be network registration or SIM. If calls work but internet does not, the problem may be mobile data, APN, bundle or data settings. Identifying the affected area helps you fix it faster.
The second step is turning airplane mode on and off. Airplane mode disables phone networks. Sometimes the network gets stuck and returns after refreshing. Turn airplane mode on for 10 to 30 seconds, then turn it off. Wait for the phone to search for network again.
The third step is restarting the phone. A simple restart can fix stuck network services. Turn off the phone, wait a little, then turn it on again. After it starts, wait one or two minutes to see if network returns.
The fourth step is removing and reinserting the SIM card. Turn off the phone, remove the SIM card, gently clean the metal part if dusty, then insert it properly. Make sure the SIM is seated correctly in the tray and is not bent. A badly seated SIM can show No SIM or cause network drops.
The fifth step is testing the SIM in another phone. This helps you know whether the problem is the SIM or the phone. If the SIM does not work in another phone, the issue may be the SIM card, line, registration or network provider. If the SIM works in another phone, the problem may be your phone or its settings.
The sixth step is testing another SIM in your phone. If another SIM gets network in your phone, then your phone can read networks and the issue may be your SIM. If all SIM cards fail in your phone, check settings, SIM slot or hardware.
The seventh step is checking whether the SIM is disabled in settings. Some Android phones allow turning off SIM cards individually. Go to Settings, SIM cards, Mobile Network or Connections, and make sure your SIM is enabled. If the phone is dual SIM, make sure the data and call SIM are selected properly.
The eighth step is choosing the correct SIM for mobile data. Dual SIM phones can have SIM 1 and SIM 2. You may have selected mobile data on the SIM without data bundle. Go to SIM settings and choose the SIM with internet bundle as default mobile data.
The ninth step is checking data bundle or balance. Before changing many settings, make sure you have an internet bundle or balance that allows data. Sometimes network exists but internet does not work because the bundle is finished or the line has a restriction.
The tenth step is turning on mobile data. Make sure mobile data is enabled in quick settings or Settings. Also make sure Data Saver is not blocking apps from using internet. If only one app is not working, check permissions and background data for that app.
The eleventh step is checking APN settings. APN is the setting that helps the phone connect to your mobile provider’s internet. If APN is wrong, calls may work but mobile data may fail. Go to Settings, Mobile Network, Access Point Names, then choose the correct APN for your provider or reset to default.
The twelfth step is resetting APN. If you previously changed APN or installed an app that changed settings, choose Reset to default in APN settings. After reset, restart the phone and try mobile data again. This helps many internet problems without touching personal data.
The thirteenth step is checking network mode. The phone may be set to 2G only, 3G only, LTE only or 5G only. If your area does not have that network, the phone may fail to get service properly. Choose a mode such as 4G/3G/2G Auto or 5G/4G/3G/2G Auto depending on the phone and network.
The fourteenth step is avoiding LTE only without reason. Some people set LTE only to force 4G, but if voice calls need fallback or 4G is weak in the area, calls may fail. Use Auto mode if you do not have a special reason for LTE only.
The fifteenth step is doing manual network selection. Go to Mobile Network, Network Operators, then search networks. Choose your provider. If manual selection fails, return to Automatic. This can help if the phone is stuck trying the wrong network.
The sixteenth step is checking network coverage in your location. If you are inside a building with thick walls, basement, rural area, mountains or weak signal area, network may be poor. Try going outside, near a window or an open place. If network returns, the problem is coverage, not the phone.
The seventeenth step is checking whether the provider has an outage. Sometimes the provider network may have problems in your area. Ask other people using the same network if they also have issues. If many people have the same issue, wait for the provider to fix it or contact customer care.
The eighteenth step is checking roaming. If you are outside the country or in an area requiring roaming, make sure roaming is enabled if needed. But if you are in your home country, do not enable data roaming without understanding costs. Roaming can increase charges in some situations.
The nineteenth step is checking data limit. Android can have data warning or data limit. If you set a limit and reached it, mobile data can be disabled. Go to Settings, Network & Internet, Data usage, then check data limit and billing cycle.
The twentieth step is turning off VPN temporarily. A VPN can make internet look broken even when mobile data exists. Turn off VPN, private DNS or firewall app temporarily and try again. If internet returns, the issue was the VPN/DNS app.
The twenty-first step is checking Private DNS. Android has a Private DNS setting. If you entered a wrong DNS, internet may fail. Go to Settings, Network, Private DNS, then set Automatic or Off temporarily. Try websites and apps again.
The twenty-second step is checking IMEI. IMEI is the phone’s identity on the network. Dial *#06#, and the phone should show IMEI. If IMEI does not appear, shows null, unknown or invalid, the phone may fail to join the network. This is a serious problem that needs an experienced technician.
The twenty-third step is being careful with rooted or flashed phones. After flashing, custom ROM or root, IMEI or baseband can be damaged. This can cause No Service. Do not try random IMEI repair tools because you can damage the phone more or break laws depending on your location.
The twenty-fourth step is checking baseband version. In About Phone, check whether baseband appears. If baseband is unknown, the network modem software may have a problem. This often needs correct firmware or professional service.
The twenty-fifth step is checking whether the phone is locked. Phones from certain carriers may be locked to one network. If you insert another network SIM, it may reject service. If the phone is imported or second-hand, make sure it is not carrier locked.
The twenty-sixth step is checking whether the line is properly registered. Many countries require SIM registration. If the line is not registered, suspended or has KYC issues, it may fail to receive service. Contact your provider if the SIM does not work even in another phone.
The twenty-seventh step is checking SMS center number if SMS cannot send. If calls and data work but SMS fails, the issue may be SMSC settings, balance, messages app or line restriction. Contact your provider for the correct SMS center number if needed.
The twenty-eighth step is checking VoLTE. VoLTE allows calls over 4G. If VoLTE settings are not working well, calls may fail on some networks. Try turning VoLTE on or off depending on your network. If calls fail but data works, this may help.
The twenty-ninth step is updating the system. A system update can fix network bugs, modem issues and SIM compatibility. Go to Settings, System Update. Make sure you have enough battery and stable internet before updating.
The thirtieth step is updating carrier services or SIM toolkit if available. Some phones depend on carrier services for network features. Update important apps from Play Store. Also restart the phone after updating.
The thirty-first step is using Reset Network Settings. This removes saved WiFi networks, Bluetooth pairings and mobile network settings, but does not delete photos or apps. Go to Settings, System, Reset options, Reset WiFi, mobile & Bluetooth. This is useful when settings are mixed up.
The thirty-second step is avoiding factory reset too early. Factory reset can fix software issues, but it deletes data. Before factory reset, try SIM tests, APN reset, network mode, manual selection, private DNS, update and reset network settings. Factory reset should be a last step.
The thirty-third step is backing up before factory reset. If you decide to factory reset, back up contacts, photos, WhatsApp, documents and important apps. Make sure you know your Google account and password so you do not get stuck after reset due to Factory Reset Protection.
The thirty-fourth step is checking hardware. If the phone fell, entered water, overheated or the SIM tray was damaged, the problem may be hardware. Signs include SIM not being detected, network dropping often, or network returning when you press a certain part of the phone. In that case, a technician is needed.
The thirty-fifth step is checking SIM tray and slot. A bent tray or dirty slot can make the SIM fail to read properly. Do not use too much force when inserting SIM. If the tray is damaged, replace it. If the slot is damaged, a hardware technician is needed.
The thirty-sixth step is separating WiFi and mobile data. Some people say “internet is not working” but WiFi works and only mobile data fails, or the opposite. Identify the connection you are using. The solution for WiFi is different from the solution for mobile data.
The thirty-seventh step is checking specific apps. If the browser opens but WhatsApp does not work, the issue may be app permission, background data, battery optimization or app outage. Check apps individually before changing all network settings.
The thirty-eighth step is checking malware or untrusted VPN apps. Some apps can change network settings, DNS or block traffic. Remove untrusted VPN, firewall, data saver or “free internet” apps. Scan with Play Protect.
The thirty-ninth step is contacting your provider with full information. Tell them your phone model, location, message shown, whether the SIM works in another phone, and the steps you tried. This helps them give correct support instead of starting with basic questions.
The fortieth step is building a habit of protecting network settings. Do not change APN, network mode, DNS, IMEI tools or system files without understanding. Do not flash incorrect firmware. Use official updates, official apps and provider settings. This reduces future network problems.
In general, Android no network can be caused by SIM card, settings, APN, network mode, mobile data limit, DNS, VPN, coverage, provider issue, IMEI, baseband, carrier lock or hardware. Start with simple steps: airplane mode, restart, SIM test, APN reset, network mode and reset network settings. If IMEI/baseband/hardware has issues, look for a technician or provider.
Remember: do not rush to factory reset or flashing before investigating. Many times the problem is a small setting. But if the phone does not show IMEI, all SIM cards fail, or network disappeared after a fall/water damage, the problem may be serious and needs professional help.
FAQ - Frequently Asked Questions
1. Why does my Android show No Service?
It may be SIM not seated properly, airplane mode, poor coverage, network mode, line restriction, provider issue, IMEI problem or hardware fault.
2. Why do calls work but internet does not?
Often mobile data is off, bundle is finished, APN is wrong, data limit is reached, VPN/DNS is causing problems, or the wrong SIM is selected for data.
3. What is APN?
APN is the setting that helps your phone connect to mobile network internet. If APN is wrong, mobile data can fail.
4. What does unknown IMEI mean?
It may indicate a modem/baseband or network software problem. The phone can fail to get network and needs an experienced technician.
5. Does Reset Network Settings delete photos?
No. It resets WiFi, Bluetooth and mobile network settings. It does not delete photos, apps or documents, but saved WiFi passwords may be removed.
6. Why does my SIM work in another phone but not mine?
The problem may be your phone settings, SIM slot, carrier lock, IMEI/baseband or network hardware.
7. Can factory reset fix network problems?
It can help if the issue is software/settings, but it deletes data. Try reset network settings and other methods before factory reset.
8. What should I do if network disappeared after the phone fell or got wet?
Do not keep trying too much. Turn off the phone if possible and take it to a hardware technician for inspection.