Slow Internet on a smartphone is one of the most annoying problems that every second user faces. Android. You are trying to download a video, but it is constantly “buffering”, or phone calls are interrupted due to a poor connection. The reasons may lie both in the settings of the device itself and in external factors: from an overloaded mobile operator tower to outdated modem firmware. In this article we will look at VoIP are interrupted due to poor connection. The reasons may lie both in the settings of the device itself and in external factors: from an overloaded mobile operator tower to outdated modem firmware. In this article we will look at practical methods for improving the network from basic to advanced, which work on most devices, including Samsung Galaxy, Xiaomi Redmi, Google Pixel and others.

It is important to understand that there is no universal solution: if the problem is poor 4G/5G coverage in your region, none software will not replace hardware signal amplification. However, in 80% of cases, the speed can be increased without purchasing additional equipment by simply setting up your smartphone correctly and using proven techniques. Let's start with simple steps and gradually move on to more complex ones.

1. Checking the current speed and diagnosing problems

Before optimizing something, you need to understand where exactly is the “bottleneck”. Weak signal, high ping, or low download speed - each problem has its own reasons. For diagnostics, use:

  • 📊 Speedtest by Ookla —shows the actual download/upload speed, ping and connection stability. Run the test 2-3 times in different places in the apartment.
  • 📡 NetMonster or Network Cell Info Lite — display the signal level in dBm, network type (4G/5G), tower ID and even its load.
  • 🔍 PingTools Network Utilities — to check packet loss and trace the route to the server (useful if sites do not open).

Pay attention to the following indicators:

  • 📶 Signal level: below -100 dBm —critically weak, -70...-90 dBm —normal.
  • ⚡ Download speed: less 10 Mbit/s on 4G is a reason for optimization.
  • 🕒 Ping: higher 100 ms —problems with responsiveness (important for games and video calls).

If the speed in Wi-Fi and the mobile network is radically different, the problem is most likely in the operator or SIM card. If both networks are slow, the phone settings or hardware limitations are to blame.

📊 What type of network do you use more often on your smartphone?
mobile data (4G/5G)
Wi-Fi at home
Wi-Fi at work/in a cafe
Both options are the same

2. Optimizing mobile network settings

Many users have not looked at the mobile data settings for years, although the keys to speeding up are hidden there. Here's what you can do without root access:

  1. Selecting network type. By default, the smartphone can use 2G/3G/4G/5G (auto), but auto-selection is not always optimal. Try setting the priority manually:
    • 📱 Go to Settings → SIM cards and mobile networks → Network type.
    • 🔄 If you 5G smartphone, but the 5G coverage is weak, choose 4G (LTE) —it’s more stable.
    • 📶 For older devices (for example, Samsung Galaxy J-series) disable 2G —it just gets in the way.
  2. Activation of VoLTE and VoWiFi. These technologies improve call quality and Internet speed during a call:
    • 📞 Turn on VoLTE in Settings → Mobile network → Advanced.
    • 📶 VoWiFi (Wi-Fi calls) is useful if the mobile network is weak, but there is stable Wi-Fi.
  • Reset APN settings. Incorrect settings APN (access points) are a common cause of slow Internet. Reset them: 
    Settings → Mobile network → Access Point Names (APN) → ⋮ → Reset to default

    If the Internet is gone after the reset, check that the APN of your operator (MTS, Beeline, Tele2) is activated (checkmark next to the name).

    • ⚠️ Attention: On some firmware (for example, MIUI from Xiaomi) the network settings menu may differ. If you don’t find the item you need, use the search in the settings (magnifying glass icon at the top of the screen).

    ☑️ Checking the mobile network settings

    Done: 0 / 4

    3. Improving the signal without additional equipment

    If the signal level is weak (-100 dBm and lower), try these methods without purchasing amplifiers:

    • 📍 Moving your phone. Even in the same room, the signal can differ by 2-3 times. Bring your phone to a window or move closer to the outside wall of the building.
    • 🔄 Reboot the modem. Turn on Airplane mode for 10-15 seconds, then turn off. This will force the phone to reconnect to the nearest tower.
    • 📵 Disable automatic network selection. Sometimes the phone gets stuck on a distant tower. Manually select the operator's network: 
      Settings → Mobile network → Network operators → Select manually

      After selection, wait for registration (may take up to 1 minute).

    • 🔋 SIM card check. A damaged or old SIM (especially the Mini-SIMformat) may limit the speed. Try moving it to another slot (if your phone supports Dual SIM) or replace it with nano-SIM.

    💡 Hidden lifehack: If you have Samsung or Google Pixel, you can forcibly block weak frequencies in the engineering menu. To do this:

    1. Dial ##4636## (or *#0011# for Samsung).
    2. Go to Information about phone → Set network type.
    3. Select LTE only or NR/LTE (for 5G).

    On devices with a processor Qualcomm Snapdragon (most flagships) you can manually select 4G/5G bands through the engineering menu, which sometimes increases the speed by 20–30%.

    4. Wi-Fi optimization: from channels to DNS

    If problems with the Internet occur only in Wi-Fi, check the following points:

    • 📶 Selecting a router channel. Overloaded channels (for example, 6 or 11 in the 2.4 GHz range) reduce speed. Use the application WiFi Analyzerto find a free channel and change it in the router settings.
    • 🔄 Change band. Range 5 GHz faster, but less stable over distance. If the phone is far from the router, switch to 2.4 GHz.
    • 🔒 Encryption type. Outdated WEP or TKIP slows down the network. Use WPA2-AES or WPA3.
    • 🌐 Changing DNS. DNS from your ISP may be slow. Try 1.1.1.1 (Cloudflare) or 8.8.8.8 (Google): 
      Settings → Wi-Fi → ⚙️ near your network → Advanced → DNS → Manual
    Parameter Recommended value Cause
    Channel width (2.4 GHz) 20 MHz A narrow channel is more stable in apartment buildings
    Channel width (5 GHz) 40 MHz or 80 MHz Wider channel - higher speed, but shorter radius
    Wi-Fi standard 802.11ac (or ax for Wi-Fi 6) Outdated standards (802.11n) limit the speed
    Wi-Fi power saving mode Off Saves battery, but reduces speed

    ⚠️ Attention: Router settings may be reset after updating the firmware. If the speed drops suddenly, check whether the provider has returned the settings to factory settings.

    5. Software acceleration methods: from cache to VPN

    Sometimes the brakes are not related to the network, but to rebooting the system or operator restrictions. Try:

    • 🧹 Clearing the DNS cache. Accumulated data may conflict with new connections. Reset the cache: 
      Settings → Applications → ⋮ → Special access → DNS management → Clear cache

      On some firmware (for example, One UI from Samsung) this item may be missing - then rebooting the phone will help.

    • 🔒 Disable traffic saving. Functions like Data Saver (in Android) or Limit Data Usage (in MIUI) artificially limit the speed. Disable them in Settings → Network and Internet → Traffic saving.
    • 🌍 Using VPN. Some operators throttle (slow down) traffic for certain services (for example YouTube or Torrent). A VPN can bypass this limitation. Try ProtonVPN or Warp from Cloudflare.
    • 📱 Closing background applications. Messengers, cloud services and games can “eat up” the channel. Check which applications are active in Settings → Applications → Running.

    💡 Useful advice:

    💡

    If after connecting to Wi-Fi the Internet works, but the mobile network does not, check your account balance. Some operators block Internet access if you have a negative balance, even if you have an unlimited tariff.

    6. Hardware solutions: from antennas to modems

    If software methods do not help, you will have to consider hardware improvements. They require investment, but provide the most noticeable increase in speed:

    • 📡 External antenna or repeater. Devices like TP-Link TL-ANT2408CL or repeaters Xiaomi Wi-Fi Repeater strengthen the 4G/5G signal. They connect via SMA connector (if the phone supports it) or work autonomously.
    • 🔌 USB modem with external antenna. If your phone does not receive the network, but you have a laptop, connect Huawei E3372 or ZTE MF833V and distribute the Internet via Wi-Fi.
    • 📱 Replacing a SIM card with an eSIM. A virtual SIM (eSIM) sometimes works more stable than a physical one, especially on new smartphones (Google Pixel 6, iPhone 13 and newer).
    • 🔋 Power Bank with signal amplifier function. Some external batteries (for example RAVPower FileHub) have a built-in Wi-Fi repeater and a port for connecting a 4G modem.

    ⚠️ Attention: Before purchasing a signal amplifier, check whether your phone supports MIMO (multi-channel reception). Without this technology, an external antenna may not be effective.

    How to check MIMO support on your phone?

    Open the application Network Cell Info Lite and look at the line MIMO in the connection information. If it says 2x2 or 4x4, your phone supports multi-channel reception.

    7. Advanced methods: engineering menu and modem firmware

    For experienced users who are willing to take risks, there are ways to deep optimization:

    • 🔧 Changing modem parameters. Through the engineering menu (##4636##) you can change:
      • Network type (for example, force enable LTE-only).
      • Frequency ranges (disable unnecessary ones so that the phone does not waste time on them scanning).
    • 📱 Firmware for a new modem. On the forums XDA Developers or 4PDA they often post updated versions of modems for popular smartphones (for example, Samsung Exynos or Qualcomm). This can improve speed by 10–50%, but requires an unlocked bootloader.
    • 🔄 Reset the radio module. Sometimes the command helps: 
      adb shell service call telephony 4 i32 1

      (requires ADB USB debugging to be enabled).

    ⚠️ Attention: Incorrect actions in the engineering menu or firmware of an incompatible modem can lead to network loss or “bricking” the phone. Make a backup EFS partition before experiments!

    💡

    Modem firmware is the most effective way to speed up the Internet, but also the riskiest. Use only verified files for your model!

    8. Alternative methods: Internet distribution and Mesh network

    If none of the methods help, consider workarounds:

    • 📲 Distributing the Internet from another device. If you have a second phone or tablet with a good network, turn on the access point on it and connect to it.
    • 🌐 Mesh Wi-Fi system. Devices like Google Nest Wi-Fi or TP-Link Deco create a single network throughout the house, automatically switching the phone between nodes.
    • 📡 Satellite Internet. In remote areas (where there are no 4G towers) Starlink Mini or analogues will help. Speed up to 100 Mbit/s, but high price.

    💡 Useful advice for travelers:

    💡

    If you are abroad and the local operator offers slow roaming, buy a local SIM card with unlimited internet. In most countries in Europe and Asia, this is cheaper than roaming from Russian operators.

    FAQ: Frequently asked questions about improving the network on Android

    🔍 Why does one phone receive 4G in the same place, and the other only 3G?

    There are several reasons:

    • Different modems (for example, Qualcomm X55 supports more bands than MediaTek Helio G80).
    • Outdated firmware modem (update your phone software).
    • Damaged SIM card or incorrect settings APN.

    Check the supported frequencies of your phone on the website GSMArena or through the app Network Signal Guru.

    ⚡ How to speed up the Internet on Android without root access?

    Without root you can:

    • Reset settings APN and enable VoLTE.
    • Use VPN to bypass throttling.
    • Clear DNS cache and disable traffic saving.
    • Switch to another Wi-Fi range (2.4 GHz → 5 GHz).

    Root is only needed for modem firmware or deep customization of the engineering menu.

    📶 Why is 5G slower than 4G?

    This is a typical problem in 2026. Possible reasons:

    • The 5G tower is overloaded (many users are connected, but there is not enough bandwidth).
    • The phone is connected to 5G, but actually uses DNS64 (transition protocol), which slows down the traffic.
    • The operator artificially limits the speed 5G for tariffs with “unlimited” Internet.

    Solution: force a switch to 4G in the network settings or contact your operator.

    🔌 Can the case affect the signal quality?

    Yes, especially if it is:

    • Metal or with magnetic inserts (shields the signal).
    • Too thick (more than 3-5 mm) and covers the antenna lines (usually located at the top and bottom of the phone).

    Try to remove the case and re-measure the signal level in dBm.

    🔄 How often do you need to update the firmware for a better network?

    Modem updates are released less frequently than major updates. Android. Check once every 2-3 months:

    • In Settings → Software update (for Samsung, Xiaomi etc.).
    • On the manufacturer's website (for example, Google uploads firmware images for Pixel).

    If there are no updates, but the network is bad, look for custom modem firmware on thematic forums.