Why the network does not work on Android: a complete analysis of the reasons and solutions

Have you picked up the phone, and instead of the usual icons 4G/5G or H+ on the screen there is a blank space, a cross, or the words “Emergency calls only”? Or is there internet, but pages won’t load and messengers refuse to send messages? Network problems on Androiddevices are one of the most common problems that users encounter. The reasons may lie either in trivial settings or in serious hardware failures.

In this article we will analyze why the network on the phone all possible scenarioswhy is the network on the phone Android stopped working: from operator errors to damage to the antenna module. You will learn how to diagnose the problem yourself, which settings to check first, and when to contact a service center. And if you have already tried rebooting your phone and removing the SIM card, don’t worry, we’ll go beyond the basic tips.

Important: some solutions require administrator rights or access to the engineering menu. If you are not sure what to do, skip these steps or contact a professional. Also remember that on devices with custom firmware (for example, LineageOS), the path to the network settings may differ from standard Android.

1. Problems with the SIM card: from mechanical damage to blocking

The first thing you need to check is the SIM card itself. Even if it looks normal on the outside, this does not guarantee its functionality. Let's start with the obvious:

• 🔄 Rebooting the phone. Yes, it’s trivial, but in 20% of cases it helps. Especially if the network disappeared after updating or installing the application.
• 📱 Checking the SIM card slot. Remove the card, inspect it for scratches, chips or dirt. Do the same with the tray: sometimes the contacts become oxidized or dirty.
• 🔌 Test in another device. Insert the SIM card into another phone. If the network does not appear, the problem is in the card or operator blocking.
• 📞 Call the operator. Perhaps your number is blocked for non-payment or by mistake. Check the line status.

If the SIM card works in another phone, but not in yours, check the slot settings. On some devices (for example Samsung Galaxy or Xiaomi Redmi), you can manually select which slot is active for calls and mobile data. Path: Settings → SIM cards and mobile networks → Name of your SIM card → Network type.

⚠️ Attention: On dual-SIM phones, sometimes there is a conflict between cards. Try disconnecting the second SIM card for 10-15 minutes, then check the operation of the first one.

It is also worth mentioning virtual SIM cards (eSIM). If you use eSIM, check its activation in the settings: Settings → Mobile network → Add mobile network. Some operators (for example MTS or Tele2) require re-activation after resetting the phone.

2. Mobile network settings: what could have gone wrong?

Even if the SIM card is working, incorrect network settings can block access to the Internet or calls. Let's start with the simplest thing:

• 🌐 Network mode. Make sure that the phone is not locked on 2G. Path: Settings → Mobile network → Preferred network type. For most regions, it is optimal to select 4G/3G/2G (auto).
• 📡 Manually selecting an operator. Sometimes the phone “forgets” the network. Try manually selecting the operator: Settings → Mobile network → Network operators → Search for networks. If your operator is not displayed, this is a sign of a hardware problem.
• 🔄 APN settings. Incorrect parameters APN (Access Point Name) - a common reason for lack of Internet for working calls. Path: Settings → Mobile network → Access points (APN). Delete all existing APNs and add a new one by requesting settings from the operator via SMS (usually a command *111# or similar).

If after the change Internet APN does not work, check whether it is enabled mobile traffic for specific applications. On Android 12+ this is done like this: Settings → Applications → [Select application] → Mobile data.

Problem	Symptoms	Solution
Wrong network mode	No 4G, only 2G/E	Select 4G/3G/2G (auto) in settings
APN is lost	There are calls, no internet	Delete old APNs, add new ones
Manually selecting an operator	No network after a flight/trip	Return “Automatic” or select an operator manually
Background limitation	The Internet works, but slowly	Disable Saving traffic in SIM settings

⚠️ Attention: On some firmware (for example, MIUI from Xiaomi) after the update, the APN settings are lost. If you recently updated your phone, check this item first.

Select automatic network mode (4G/3G/2G)|

Check whether mobile traffic is enabled for the SIM card|

Delete and re-install add APN settings|

Disable data saving (if enabled)-->

3. Software failures: from updates to viruses

If the network disappears after installing an application, update Android or “by itself,” the software is to blame. Here's what to do:

• 🔄 Safe Mode. Boot your phone into Safe Mode (hold the Power button → Safe Mode). If the network appears, the problem is in one of the installed applications. Remove recently added apps.
• 📱 Reset network settings. This will return all network settings to factory settings: Settings → System → Reset → Reset Wi-Fi settings, mobile network and Bluetooth.
• 🛡️ Check for viruses. Some malware blocks access to the network. Scan your phone Malwarebytes or the built-in antivirus (for example, Google Play Protect).
• 🔧 Clear cache Telephony Provider. Go to Settings → Applications → Show system → Telephony Provider → Storage → Clear cache.

If the problem appeared after the update Android, try rolling back to previous version (if available) or wait for a patch from the manufacturer. On forums 4PDA they often post temporary solutions for specific models (for example, for Samsung Galaxy S22 after One UI 6.0).

It is also worth checking date and time on your phone. If they go wrong (for example, after replacing the battery), this may block access to the network. Set automatic detection: Settings → System → Date and time → Automatic.

What to do if the network disappears after the firmware?

If you installed custom firmware (for example, LineageOS or Pixel Experience), the problem may be the absence of modem files (firmware) for your model. Solution:

1. Download the original firmware for your model from the manufacturer’s website.

2. Flash it via Odin (for Samsung) or Fastboot (for other brands).

3. reset to factory settings (wipe data/factory reset in recovery).

Attention: incorrect firmware can turn the phone into a “brick”. service.

4. Hardware faults: from the antenna to the motherboard

If none of the software methods helped, the problem may be in the hardware. Here are the most common hardware ones reasons:

• 📶 Damage to the antenna module. Often occurs after falls or moisture. Symptoms: the network appears and disappears, especially when the position of the phone changes.
• 🔌 Oxidation of SIM card contacts. If the phone was in high humidity conditions, the slot contacts could oxidize. The solution is cleaning with alcohol or replacing the slot.
• 🔋 Faulty motherboard boards. If the phone does not see the SIM card at all (even after replacement), the problem may be in modem or power circuits.
• 📱 Damage after repair. If the network disappeared after replacing the screen, battery or other repair, the antenna cable may have been damaged.

How to check for a hardware fault?

1. Try to insert the SIM card into another phone - if it works, the problem is in your device.
2. Check whether the phone can connect to the networks Wi-Fi i Bluetooth. If not, it may be faulty Wi-Fi/Bluetooth module, which is often combined with the mobile network antenna.
3. Use test codes to check the antenna:

   ##4636##

   In the menu Phone information look at the parameter Network status. If it shows Disabled or Error it is a sign of a hardware problem.

⚠️ Attention: If the phone has been dropped into water or subjected to strong impacts, do not try to disassemble it yourself. Oxidation can spread to other components, and without special equipment you risk worsening the damage.

The cost of repairs depends on the phone model. For example, replacing an antenna module with a iPhone or Samsung Galaxy Sseries will cost 3–7 thousand rubles, whereas with a budget Redmi or Realme —1–2 thousand rubles. In some cases, it is cheaper to buy a new phone, especially if the problem is with the motherboard.

5. Problems on the operator's side: from technical work to blocking

Sometimes it is not the phone that is to blame, but the telecom operator. Here's how to check it:

• 📡 Technical work. Look at the news on the operator’s website or on its official social networks. For example, Megafon often reports about scheduled work in the Telegramchannel.
• 🔒 Number blocking. If you have not topped up your account for a long time or connected suspicious services, the operator could block the line. Check your balance: *100# (MTS), *102# (Beeline), *105# (Megafon).
• 🌍 Roaming. If you are traveling, make sure roaming enabled: Settings → Mobile network → Roaming. Some operators (for example Yota) require separate activation of international roaming.
• 📶 Network overload. In crowded places (concerts, stadiums), the network may “lie down” due to overload. Try switching to 3G manually.

If you suspect blocking, call the operator from another phone or use online chat. For example, Tele2 has a chat in Telegram (@Tele2_support_bot), and MTS has in VKontakte. Do not forget that some blockings (for example, by court decision) are not lifted until the problem is resolved.

⚠️ Attention: If you use virtual operator (for example, Tinkoff Mobile, SberMobile), they may have their own limitations. For example, some virtual operators do not work in roaming or have traffic restrictions.

6. Conflicts with firmware and modifications

If you installed custom firmware, received root access or modified system files, the problem may be with them. Common reasons:

• 🔧 Incompatible firmware. For example, the firmware for the Globalversion of the phone is installed on the Chinesemodel (and vice versa). This often breaks the operation of the modem.
• 📱 Removing system applications. If you have removed Telephony Provider, IMS Service or other system components, the network will not work.
• 🔒 Wrong rights SELinux. After modifications, the system may block access to network functions. Check the status SELinux through the app SELinux Checker.
• 🔄 Reset IMEI. If the firmware is reset IMEI, the phone will not catch the network. Check IMEI with the command:

  *#06#

  If it shows Null or incorrect numbers, restoration is required.

How to restore IMEI?

1. Download the app Maui META (for Mediatek) or QCN Rebuilder (for Qualcomm).
2. Enter the original IMEI (it is indicated on the box or under the battery).
3. Flash it through Fastboot or Engineering Mode.

⚠️ Attention: Restoring IMEI may be illegal in some countries if you use a non-original number. In Russia, this is only allowed to restore the factory IMEI.

If you are not sure of your actions, it is better to contact the service. Incorrect IMEI repair can lead to complete loss of the network.

7. External interference: from weather to government restrictions

Sometimes the problem is not in the phone or the operator, but in external factors. Let's consider rare but possible reasons:

• 🌩️ Weather conditions. Severe thunderstorms, solar activity or magnetic storms can temporarily degrade communications. Check the forecast on sites like Tesis (tesis.lebedev.ru).
• 🏢 Architectural interference. In basements, elevators or buildings with thick walls (for example, in the subway), the network may disappear. Try going outside.
• 🚨 Government restrictions. In some regions (for example, near military installations), mobile communications may be blocked. Also check whether your number is included in the register of “undesirable” subscribers (for example, under the law “on telephone scammers”).
• 📡 Local jammers. In some public places (cinemas, theaters) signal jammers may be used. This is illegal, but it does occur.

If you suspect external interference, try:

1. Use Wi-Fi Calling (if supported by your operator). This will allow you to make calls over Wi-Fi. Path: Settings → SIM cards and mobile networks → Wi-Fi Calling.
2. Connect external antenna (for stationary use). Some phones (for example Samsung Galaxy XCover) support connecting external antennas via an adapter.
3. Enable airplane mode for 30 secondsthen disable. This sometimes helps to re-register online.

Also worth mentioning geoblocking. Some phones (especially those brought from abroad) may have restrictions on working in Russian networks. For example, models iPhonepurchased in the USA sometimes do not support frequencies of Russian operators.

8. Diagnostics and contacting service

If you have tried all the methods, but the network still does not work, it’s time to contact specialists. Here's how to prepare for a visit to the service:

• 📝 Write down the symptoms. When did the network disappear? After what (crashes, updates, application installations)? This will help the technician diagnose the problem faster.
• 🔧 Make a backup copy. If a reset or flashing is required, you will not lose data. Use Google Drive or Smart Switch (to Samsung).
• 📱 Check warranty. If the phone is under warranty, do not disassemble it yourself - this will void the warranty.
• 💰 Check out the cost of repairs. Call the service and ask how much diagnostics and possible repairs will cost. For example, replacing an antenna with iPhone 13 will cost 5–8 thousand rubles.

What to do if the phone is on warranty?

1. Contact the authorized service center manufacturer. For Samsung this Samsung Service, for Xiaomi — Mi Service.
2. Take from yourself receipts, box and components. Some services require proof of purchase.
3. If you are denied warranty repairs, request written refusal indicating the reason.

Average repair time:

Problem	Repair period	Cost (approximately)
Replacing the antenna module	1–3 days	1 500–7 000 ₽
Cleaning SIM card contacts	1 day	500–1 500 ₽
Restoring IMEI	1–2 days	1 000–3 000 ₽
Motherboard repair	3–7 days	3 000–15 000 ₽

⚠️ Attention: If you are offered to “flash your phone in 5 minutes” on the market or in a dubious service, be careful. Poor quality firmware can permanently damage your phone. It is better to contact official or trusted services.

FAQ: Frequently asked questions about network problems on Android

📶 Why does the phone show the network, but the Internet does not work?

This is a typical problem with APN settings. Delete all APNs in the menu Settings → Mobile network → Access points (APN) and add a new one by requesting settings from the operator (usually via SMS to a number 111 or similar). Also check if traffic saving mode is enabled.

🔄 After updating Android, the network disappeared. What to do?

First try resetting the network settings: Settings → System → Reset → Reset Wi-Fi, mobile network and Bluetooth. If it doesn’t help, check if IMEI (dial *#06#) is correct. On some firmware (for example MIUI 14), after the update, the SIM card must be reactivated.

📱 The phone does not see the SIM card after being dropped. Is this a hardware failure?

Most likely, yes. If it fell, it could be damaged SIM card tray, antenna module or contacts on the motherboard. Try carefully cleaning the contacts with alcohol, but if this does not help, contact service. Self-repair may aggravate the problem.

🔒 The operator says that the number is not blocked, but the network does not work. What's the matter?

Perhaps the problem is regional restrictions. Some operators (for example, Yota or Tinkoff Mobile) link the number to the region. If you haven’t used your SIM card in your “home” region for a long time, it may have been deactivated. Also check if the “Banning outgoing” service is enabled (sometimes it is activated accidentally).

🌍 When roaming, the phone does not pick up the network. What to check?

Make sure that:

1. Roaming is enabled in the settings: Settings → Mobile network → Roaming.
2. You have enough funds in your account (some operators block roaming when negative balance).
3. Your tariff supports roaming in this country (check on the operator's website).
4. The phone supports frequencies of local operators (for example, the USA uses different frequencies than in Russia).

If everything is in order, but the network does not appear, try manually selecting the operator: Settings → Mobile network → Network operators → Search for networks.