A situation where a mobile device and a printer are in the same room but refuse to communicate is one of the most common problems with modern peripherals. Users often encounter this problem after updating their operating system or changing their router. the smartphone stops detecting Available printing devices. This can happen for a variety of reasons, from simple frequency desynchronization to network protocol failures.
Before you panic and take your equipment to a service center, you need to carry out a basic check. connection diagnosticsOften, the problem lies in the router's security settings or that one of the devices has gone dormant and isn't responding to search requests. Understanding how wireless networks work will help you quickly troubleshoot the issue yourself, without wasting time waiting for a technician.
In this article we will examine in detail all the possible scenarios why mobile phone If your printer is ignoring your printer, we'll offer step-by-step instructions for restoring the connection. We'll cover both standard connection methods and specific settings for different operating systems.
Checking the basic network configuration
The most common reason for a lack of connection is simply that your devices are on different networks. Make sure your smartphone and the printer are connected to the same Wi-Fi routerIf you have a dual-band router operating on 2.4 GHz and 5 GHz frequencies, check that your devices aren't running on different bands, as some older printer models may not recognize devices running on different frequency bands.
It's also worth paying attention to the "Guest Network" feature. If your phone is connected to a guest Wi-Fi network and your printer is connected to the main Wi-Fi network (or vice versa), they will be isolated from each other due to the router's security policy. In this case, IP addresses will belong to different subnets, making direct data exchange impossible.
⚠️ Note: Some corporate routers and ISPs use a feature called AP Isolation (Client Isolation), which prevents devices within the same network from communicating with each other. If you are in an office or dorm, please contact your network administrator.
To check your phone's current connection settings, go to Wi-Fi settings and view the connection details. You'll need to ensure the connection status is active and an IP address has been obtained. Your printer will usually have a network report button or an on-screen menu that displays Network StatusCompare the first three digits of the IP address (e.g. 192.168.1) on both devices – they should match.
Diagnosing Wi-Fi Direct Mode
If the connection through the main router fails or the network is temporarily unavailable, it is worth using the technology Wi-Fi DirectThis mode allows the phone to connect directly to the printer, bypassing the router. However, many users don't realize that when enabling this mode on the printer, the phone must search for the device in the Wi-Fi Direct list, not the general list of available networks.
A conflict often occurs when both the infrastructure (via router) and Direct modes are activated on the printer. In such cases mobile application It may be confusing which interface to access. It's recommended to temporarily disable the connection to the main router on the printer itself via its control panel, leaving only the direct connection.
- 📱 Make sure Wi-Fi is turned on on your phone, even if you don't have internet access.
- 🔍 In the list of available networks, look for a name that begins with "DIRECT-" or your printer model.
- 🔑 When connecting, you may be required to enter a PIN code, which is usually displayed on the MFP screen or printed on a sticker.
This is normal behavior. Once printing is complete, you can disconnect or switch back to the connection.
Driver and application compatibility issues
Modern operating systems Android And iOS They have built-in printing services (Mopria for Android and AirPrint for iOS) that automatically detect compatible devices. However, if your printer is relatively old or very new, the system drivers may be missing. In this case, the phone physically "sees" the device on the network, but doesn't understand how to use it.
The solution is to install the official app from the device manufacturer. Companies like HP, Canon, Epson And Brother They develop their own utilities that contain the necessary proprietary drivers. Without such software, the phone may display the printer as an "Unknown Device" or even ignore its presence on the network.
Check the version of the installed app in the Google Play or App Store. An outdated version may not work correctly with new phone OS updates. Update the app to the latest available version and try adding the printer again using the "Add Device" menu within the app.
☑️ Software check
Sometimes clearing the print service cache helps. On Android, you can do this by going to Settings → Applications → Show system processes → Print Service (or Mopria) and select "Clear Cache." This will clear temporary detection errors.
Security settings and firewalls
Antivirus programs and built-in firewalls on your phone or router can block ports required for printing. Printing protocols often use specific ports (for example, 9100 for RAW or 515 for LPR), which can be closed for security reasons.
If you're using a corporate network or a router with advanced settings, check your blacklist or MAC address filtering settings. Your phone's MAC address may be blocked, or, conversely, your printer may be blocked from initiating connections to new clients.
| Protocol | Port | Purpose | Status |
|---|---|---|---|
| IPP | 631 | Internet Printing Protocol | Must be open |
| RAW | 9100 | Direct data printing | Critical |
| mDNS | 5353 | Search for devices (Bonjour/AirPrint) | Must be open |
| SNMP | 161 | Condition monitoring | Desirable |
Particular attention should be paid to the Multicast and IGMP Snooping settings on the router. Protocol mDNS (used for AirPrint and Google Cloud Print), which allows the phone to identify the printer by name, works via multicast traffic. If this feature is disabled on the router, the phone simply won't receive a response packet from the printer when it requests it.
⚠️ Note: Router settings interfaces are constantly being updated. The layout of menu items may differ from what's described. Look for sections labeled "Wireless," "Advanced," "Multicast," or "IGMP."
Connection specifics for Android and iOS
iPhone owners are confronted with technology AirPrint, which requires both devices to be on the same subnet and support the protocol. If the printer is old and doesn't support AirPrint, the iPhone won't see it without the help of intermediary software or a special app from the manufacturer.
On Android, the situation is more diverse due to the open nature of the system. Mopria Print ServiceIf the printer still isn't found after installing this plugin, check the app's permissions. In newer versions of Android (10, 11, 12, and above), network scanning requires Location permission, as scanning Wi-Fi networks is considered geolocation data.
- 🍏 For iOS: Make sure "Local network access" is enabled in the privacy settings for the print app.
- 🤖 For Android: Check if the "Power Saving" mode is enabled, which disables the Wi-Fi module in the background.
- 🔄 Try forgetting the Wi-Fi network on your phone and reconnecting using the password.
It's also worth noting the difference in behavior when using guest modes. iOS devices can automatically switch to cellular data if the Wi-Fi network doesn't have internet access, which interrupts the printer search process. Disable cellular data during setup.
Hidden developer settings
In some cases (rarely), enabling the "Always enable Wi-Fi scanning" option in the Android Developer Options menu helps. This forces the Wi-Fi module to constantly scan for networks, even when the screen is off.
Hardware failures and static electricity
Physical causes shouldn't be discounted either. The Wi-Fi module inside the printer is a fully-fledged computer that can freeze. Static electricity, power surges, or simply prolonged operation without rebooting can cause the network adapter to stop responding, even though the printer itself is functioning normally.
Resetting your printer's network settings to factory defaults is a drastic, but often the only reliable solution. This will delete all saved Wi-Fi passwords and IP settings. After the reset, you'll need to re-enter your network information through the printer's control panel or via WPS.
A hard reset is usually performed using a combination of buttons. For example, hold down the button Wireless and the button Cancel (Red cross) simultaneously for 3-5 seconds until the indicators flash. The exact combination for your model HP, Canon or Epson It is better to find it in the instructions, as it is unique for each device.
If after all these steps the phone still doesn't detect the printer, the Wi-Fi module inside the printer may be faulty. In this case, the only solution is to connect via a USB cable (using an OTG adapter for the phone) or contact a service center.
Why is the printer visible on the network, but the status is "Offline"?
This means the phone has detected the device by its MAC address but is unable to establish a full connection with it. Most often, the problem is an incorrect IP address (it may have changed after a router reboot, as it wasn't assigned statically) or ports being blocked by an antivirus program.
Is it possible to print if the printer is connected to the computer via USB?
Yes, but only if the computer acts as a print server and has the appropriate software for sharing the printer over the network. Directly connecting the phone to the computer's USB port won't help in this case; the phone must see the virtual network printer.
Does internet speed affect typing speed?
No, your internet speed does not affect data transfer speed within your local Wi-Fi network. Printing occurs directly between the router and the devices. However, if the Wi-Fi channel is heavily loaded with other devices (watching 4K video, downloading), printing may be slow or interrupted.