It's understandable that a smartphone and a multifunctional device are in the same apartment but can't "see" each other. You're trying to print an important document or scan a photo, but the list of available printers is empty, even though the router's light is green. The problem isn't a hardware failure, but rather a communication issue between mobile protocols and the network settings of the peripherals.
Most often, the cause lies in a simple mismatch of frequency ranges or ports blocked by the router's firewall. Mobile operating systems Android And iOS use different mechanisms for discovering network devices, such as Apple AirPrint or MopriaIf even one parameter in the "router-printer-phone" chain is configured incorrectly, the connection will fail. In this article, we'll take a detailed look at why this happens and how to get the devices working together on a single network.
Checking basic connectivity and frequency ranges
The first step in troubleshooting is to ensure both devices are on the same local network. This seems obvious, but users often connect their phone to a guest Wi-Fi network or a 5 GHz access point, while the printer only operates on the 5 GHz frequency. 2.4 GHzMost budget and mid-range MFP models do not support dual-band mode and only "see" older communication standards.
If your router broadcasts two networks with the same name (Smart Connect feature), the printer may become stuck on one frequency and the phone may switch to another, causing them to stop detecting each other. In this case, you need to access the router settings and temporarily separate the networks by giving them different names, for example, HomeWiFi_2.4 And HomeWiFi_5. After this, connect both devices to the network with the ending 2.4.
⚠️ Note: Some modern routers automatically isolate devices from each other for security purposes. Make sure "AP Isolation" or "Client Isolation" is disabled in your wireless network settings. This prevents devices within the network from communicating with each other.
It's also worth checking if your smartphone is connected to a 4G/5G mobile internet connection. Sometimes, if the Wi-Fi signal is weak, the phone automatically switches to the carrier's data connection, disconnecting the local connection to the printer. Force Wi-Fi on your phone to turn on and disable mobile data to check.
Problems with print drivers and system services
Even with a perfect network setup, a phone may ignore the MFP if the system lacks the necessary components to handle the print queue. Unlike computers, where drivers are often installed automatically, mobile platforms require specific service plugins. This is most common on Android. Mopria Print Service or Default Print Service, and for iOS, built-in technology AirPrint.
If you own an Android smartphone, go to the system settings and find the "Connections" or "Connected Devices" section. There should be a "Print" option. If the print service is disabled or the plugin status is "Not Working," the phone will physically be unable to send the print job to the device. Reinstalling the official plugin from your MFP manufacturer often helps, for example, HP Print Service Plugin or Epson Print Enabler.
- 📱 Check if the system print service is enabled in Android settings.
- 🔄 Update your printer manufacturer's plugin app in the Google Play Market.
- 🔍 Make sure that the print settings are set to "All Networks" and not just "USB".
- ⚙️ Restart the print service by turning the corresponding switch off and on in the menu.
iPhone owners have it easier: AirPrint technology is built into the system. However, if your phone doesn't detect your printer, the issue may be with your iOS version. Outdated phone software may not work properly with the new security protocols implemented in recent MFP models. Check for system updates in the section Main → Software Update.
IP addressing settings and static address
One of the most insidious causes of connection loss is dynamic IP address change. By default, the router assigns addresses to devices through DHCPThis means that today your printer has an address 192.168.1.50, and after rebooting the router, it can get 192.168.1.55The phone continues to dial the old address, believing the printer is offline.
For stable operation in a local network, it is recommended to assign it to the MFP static IP addressThis can be done in two ways: through the printer's web interface (by entering its current IP address in the browser) or through the DHCP Reservation settings in the router. The second method is more reliable, as the router will always assign the same address to the printer.
To assign a static IP address to the device itself, you need to know the gateway address (usually the router's address) and subnet mask. You can find this information in the Wi-Fi connection properties on your phone. Then, in the printer menu, find the section Network → TCP/IP and switch the mode with Auto on Manual.
| Parameter | Example of meaning | Where to get the value | Importance |
|---|---|---|---|
| IP address | 192.168.1.150 | Any free one within the router's range | Critical |
| Subnet mask | 255.255.255.0 | Standard for home networks | High |
| Gateway | 192.168.1.1 | Your router's address | Critical |
| DNS server | 8.8.8.8 | Google DNS or router address | Average |
⚠️ Important: When manually setting the IP address, ensure the selected number (the last part of the address) is not already occupied by another device. It's best to choose values in the upper range, such as above 150, to avoid conflicts with phones and laptops.
☑️ Setting up a static IP
The impact of antiviruses and firewalls
Security is good, but sometimes it interferes with your work. Built-in firewalls in routers or antivirus software on computers connected to the same network can block ports needed for printing protocols. Protocols IPP (Internet Printing Protocol) and LPD use specific ports (usually 631 and 515 respectively), which can be closed by default in "High Security" mode.
If you have a complex network infrastructure with separate VLANs or guest zones, ensure that traffic is allowed between them. Often, MFPs are connected to the main network, while guest phones are connected to an isolated network. In this case, the phone will physically be unable to send a data packet to the printer, as the router will block inter-network communication.
It's also worth checking the power saving settings on the MFP itself. Many models go into deep sleep after 10-15 minutes of inactivity and disconnect from Wi-Fi, ceasing to respond to search requests. In the printer settings, find the section Ecology or Energy settings and increase the sleep timer or disable the Deep Sleep feature when using Wi-Fi.
List of ports for printing
If you're setting up a corporate firewall, make sure the following ports are open: UDP 631 (IPP), TCP 9100 (Raw Print), and UDP 515 (LPD). Blocking any of these ports may result in the phone seeing the printer but not being able to send a document.
Connection specifics on Android and iOS
The approach to searching for devices varies significantly across platforms. Android Relies on active network scanning and installed service plugins. If a plugin fails, the search will return no results. Furthermore, on some operating systems (such as MIUI or OneUI), aggressive battery optimization can kill the printer search process in the background.
On devices Apple Bonjour (mDNS) technology is used, which broadcasts multicast packets. If your router doesn't handle multicast traffic correctly (which can happen on cheaper models), the iPhone simply won't receive a response from the printer. In this case, rebooting the router helps, clearing the ARP table and re-registering all devices on the network.
Sometimes a simple but effective method helps: "forget" the Wi-Fi network on your phone and reconnect, entering the password. This resets the network settings cache and forces the phone to re-establish a handshake with the router, obtaining fresh information about available services on the network.
- 🍏 On iPhone: Make sure Bluetooth is turned on (it's used for initial AirPrint discovery).
- 🤖 On Android: Grant permission to the Print app to access your location (required for Wi-Fi scanning).
- 📡 Check if Airplane mode is enabled, which could partially block the Wi-Fi module.
- 🔄 Try connecting your phone to a different Wi-Fi network (for example, share it from another phone) to check if the module is working properly.
Reset network settings and reconnect
If software methods fail, a radical but effective step remains: a complete reset of the MFP's network settings. Configuration errors may have accumulated in the printer's memory that cannot be cleared by a simple reboot. A reset will return the network module to factory settings, clearing old IP addresses and passwords.
The reset procedure varies for each model. Typically, you need to press a combination of buttons on the control panel (e.g., "Wireless" + "Cancel") or find the option Restore Network Settings in the menu. After the reset, the printer will create its own access point or begin flashing its indicator, indicating it's ready for a new setup.
After resetting, restart the WPS procedure (if your router supports it) or manually connect via the manufacturer's app. This will ensure a fresh connection with the latest security and addressing settings.
⚠️ Note: Interfaces and settings menus may vary depending on your MFP model and firmware version. If you don't find an exact match for the menu items, please refer to the user manual on the manufacturer's official website, as the location of network settings may vary.
WPS method
The fastest way to connect a printer is to use the WPS button on your router. Press it, then select "Wireless" → "WPS" in the printer menu. The devices will automatically exchange passwords and settings without any typing.
Why does the phone see the printer, but says "Print error"?
Most often, this means there's a connection, but the device is out of paper, the document is jammed, or the lid is open. Another possible cause is a full print buffer on the phone. Try clearing the print queue in Android notifications or the iPhone print center.
Is it possible to connect a printer directly to a phone without a router?
Yes, most modern MFPs support Wi-Fi Direct. In this mode, the printer creates its own network, which you connect to just like regular Wi-Fi. The password is usually found on a sticker on the printer's housing.
My phone stopped detecting the printer after updating iOS/Android. What should I do?
OS updates often change security policies. Go to your privacy settings and ensure that system printing services have permission to access the local network. You may also need to update the printer's firmware.
Does internet speed affect Wi-Fi printing?
No, the speed of your external internet connection isn't important. What matters is the speed and stability of your internal local area network (LAN). Even without internet access, printing will work if your router is working properly.