How to update the Internet on a Samsung phone: from APN settings to network reset

• 📱 Go to Settings → SIM cards and mobile networks → [Your operator] → Update profile.
• ⚠️ If the option is missing, contact operator support and request sending a new profile via SMS.

On some models (for example, Galaxy Z Fold/Flip), after updating the profile, a reboot of the communication module is required. To do this:

1. Turn on Airplane mode for 30 seconds.
2. Disable it and wait for re-registration on the network (the antenna icon should blink).

3. Resetting network settings: when this is the only option

If updating the APN and profile did not help, the next step is full reset of network settings. This procedure deletes all saved Wi-Fi networks, passwords, Bluetooth settings and mobile data settings, returning them to factory defaults. On Samsung the reset is performed without deleting personal data, but you will need to re-configure connections.

Instructions:

• ⚙️ Go to Settings → General management → Reset → Reset network settings.
• 🔐 Enter your PIN code or pattern (if prompted).
• 📱 Confirm the reset and wait for the phone to reboot (it will take 1-2 minutes).
• 🔄 After turning on, re-configure the mobile data (APN will be downloaded automatically or will require manual entry).

On models with One UI 5.0 and newer after After resetting, a notification may appear "A new operator configuration update has been detected" —confirm its installation. If the reset does not help, the reason may be software failure (solved by flashing) or hardware failure (for example, damage to the antenna module).

📊 How often do you encounter mobile data problems?
Often (once a week or more often)
Sometimes (once a month)
Nearby (once a month) six months)
Never

4. Checking and updating the firmware of the communication module

The communication module (modem) in smartphones Samsung has its own firmware, which is sometimes updated separately from the main system. If you have an old version of the modem, the phone may not work correctly with new operator base stations, which leads to interruptions in communication or low Internet speed.

You can check and update the modem firmware like this:

1. 📱 Go to Settings → Phone information → Software information.
2. 🔍 Find the line Baseband version (or Baseband version). This is the modem firmware version.
3. 🔄 Compare it with the latest version for your model on the website Sammobile or in the official application Samsung Members.
4. 📲 If an update is available, install it via Settings → Software update (select Download and install).

On some models (for example, Galaxy Note 20 or Galaxy S21), the modem firmware is updated only together with the main software. If you have an outdated version, but the system says “No update”, try:

• 🔌 Connect to a PC and use the app Samsung Smart Switch to force check for updates.
• 🌍 Manually download the firmware from the website Sammobile and flash it via Odin (only for advanced users!).
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Updating your modem firmware can significantly improve your internet speed, especially if you are using 5G. After the update, it is recommended to reset the network settings (see section 3).

5. Diagnosis of hardware problems: when the software is not to blame

If all software methods have been tried, but the Internet still does not work, the reason may lie in hardware. The most common malfunctions:

Symptom	Possible cause	Solution
The Internet only works in 2G, 4G/5G missing	Damage to the antenna module or cable	Diagnostics at a service center, antenna replacement
Constant connection breaks, even with a good signal level	Faulty SIM card or slot	Replacing the SIM card with a new one (preferably nano-SIM), cleaning the slot contacts
The phone does not connect to the network after falling or getting wet	Damage to the motherboard (communication module)	Service repair, module replacement
Low Internet speed at full signal strength	Overheating of the processor (throttling)	Cleaning dust, replacing thermal paste

For self-diagnosis:

1. 🔍 Check if the Internet works on another SIM card (for example, from another operator).
2. 📡 Use the application NetMonster or CellMapper to analyze the signal level and frequencies.
3. 🔧 If the phone has been dropped or gotten wet, disassemble it (if you have experience) and check the antenna contacts.

Try another SIM card

Check the signal level in the service menu (*#0011#)

Inspect the phone for physical damage

Test the Internet in another location (exclude poor coverage area)

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If you suspect a hardware fault, but are not sure — use the hidden service menu Samsung:

1. Dial *#0011# —the current state of the communication module is displayed here.
2. If the line RRC State indicates Idle, and the network does not receive, the problem is in the antenna or SIM card.
3. If Network Type is displayed Unknown the modem firmware may fail.

6. Alternative methods: from VPN to changing DNS

Sometimes the problem lies not in the phone, but in the routing of the operator's traffic. In such cases, non-trivial solutions help:

• 🌐 Changing DNS:

  By default, operators use their own DNS servers, which can be slow. Try replacing them with 1.1.1.1 (Cloudflare) or 8.8.8.8 (Google). To do this:

  1. Go to Settings → Connections → Other networks → Mobile networks → Access points (APN).
  2. Select your APN and in the field DNS enter a new one address.
  3. Save and reboot your phone.
• 🔒 Using a VPN:

  Some operators limit the speed for certain services. A VPN (for example ProtonVPN or Warp from Cloudflare) can bypass these restrictions. Install the application from Google Play, connect to a server in your country and check the speed.

• 📡 Force network selection:

  If the phone clings to an overloaded tower, you can manually select another network:

  1. Dial ##4636## and select Phone information.
  2. In the section Set preferred network type install LTE only (if you need 4G) or NR/LTE (for 5G).

On models with One UI 6.0 and newer there is a hidden function "Improving the mobile network"that optimizes the connection. To activate it:

1. Go to Settings → Connections → Mobile networks.
2. Click on the three dots in the upper right corner and select Improving the network.
3. Enable the option and wait for optimization (may take up to 5 minutes).
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If the speed increased after changing DNS or using a VPN, the problem was on the operator’s side. Report this to support: perhaps they are limiting traffic for your tariff.

7. Common mistakes and how to avoid them

When trying to “update the Internet,” users often make mistakes that only aggravate the problem. Here are the most common:

• ❌ Deleting all APNs:

  If you manually deleted all access points, the phone will not be able to automatically load new ones. In this case, you will have to call the operator and request settings.

• ❌ Using old USSD commands:

  Codes like ##4636## may differ for different models. For example, on the Galaxy A-series, some commands do not work.

• ❌ Ignoring software updates:

  If you delay installing updates Android, the modem firmware also remains outdated, which leads to problems with 5G.

• ❌ Independent firmware without backup:

  An attempt to flash the modem via Odin without a backup can lead to “bricking” phone.

To avoid problems:

• 📌 Before any manipulations with the network create a backup via Samsung Cloud or Smart Switch.
• 🔄 Always after changes restart the phone —many settings are applied only after a reboot.
• 📡 If you are roaming, check if the operator is blocking some functions (for example, 5G).
💡

Most problems with the Internet on Samsung can be solved in the following order: APN → operator profile → network reset → firmware update. If nothing helps, either the operator or the hardware is to blame.

FAQ: Answers to frequently asked questions

🔹 Why does the Internet still not work after updating the APN?

Possible reasons:

• The operator temporarily blocks your SIM card (check your balance or service status).
• The phone has an energy saving mode activated, which limits background traffic.
• In your region, technical work is underway at base stations.

Solution: contact your operator or try using the phone in another location (for example, in the city center).

🔹 How to speed up the Internet on Samsung if the speed is low?
Try:
1. Disable Energy saving mode in the settings.
2. Manually select network 4G (LTE) instead of Auto.
3. Install the application Internet Speed Master to optimize the connection.
4. Change DNS to 1.1.1.1 or 8.8.4.4.
🔹 Is it possible to update the Internet without rebooting the phone?
Yes, but not all methods will work without a reboot. For example:
• APN update is applied immediately, but may require reconnecting to the network.
• Resetting network settings always requires a reboot.
• Changing DNS works without rebooting, but the speed may not update immediately.
🔹 Why on Samsung 5G does not work, although the phone supports it?

Reasons:

• Your SIM card does not support 5G (you need USIM).
• The option is not activated in the APN settings NR (5G).
• The operator does not provide 5G in your region.
• The modem firmware is outdated.

Solution: update your operator profile, check your APN settings and contact support to clarify coverage.

🔹 What to do if all Wi-Fi passwords are lost after a network reset?
Unfortunately, resetting the network deletes all saved passwords. To recover them:
1. Connect to each network again and enter passwords manually.
2. If you synchronized passwords with your account Google, they can be restored automatically after logging in.
3. Use applications like WiFi Password Viewer (root access required).

If none of the methods helped, the problem may be on the operator’s side. Contact support and report:

• Phone model and version One UI.
• Test results from the service menu (*#0011#).
• Location where problems are observed.