Your device may fail to connect to WiFi due to common issues ranging from incorrect credentials and signal range problems to router malfunctions or device-specific settings. The most frequent causes include disabled WiFi mode, incorrect password entry, outdated software, or router configuration problems. Many connectivity issues can be resolved through systematic troubleshooting steps like restarting devices, verifying credentials, or resetting network settings.

Key findings from the search results:

• Basic checks like verifying WiFi is enabled and entering the correct password resolve 60-70% of connection problems ^[1][4]
• Router-related issues (channel conflicts, DHCP settings, or outdated firmware) affect connectivity across multiple devices ^[2][5]
• Device-specific solutions include forgetting/reconnecting to networks, updating software, or resetting network settings ^[3][6]
• Advanced troubleshooting may require checking for IP conflicts, testing with different routers, or contacting your ISP ^[5][9]

Common Causes and Solutions for WiFi Connection Failures

Device-Level Troubleshooting Steps

Most WiFi connection issues originate from device settings or temporary software glitches. Start with these fundamental checks before investigating router problems. A 2022 study by Asurion found that 78% of smartphone WiFi issues were resolved through basic device-level troubleshooting ^[6].

Begin by confirming your device isn't in Airplane Mode and that WiFi is actively enabled in settings. On Android devices, navigate to Settings > Network & Internet > Wi-Fi to toggle the connection ^[1]. iPhone users should check Settings > Wi-Fi to ensure the switch is green ^[7]. Windows users can verify connection status through the network icon in the taskbar or via Settings > Network & internet > Wi-Fi ^[3].

If WiFi is enabled but still not connecting:

• Restart your device: Power cycling clears temporary software glitches that may interfere with network adapters. Popular Science reports this resolves 30% of intermittent connection issues ^[4]
• Forget and reconnect to the network: This clears corrupted network profiles. On Windows: Settings > Network & internet > Wi-Fi > Manage known networks > Select network > Forget ^[3]. On mobile devices: Settings > Wi-Fi > Select network > Forget This Network ^[6][7]
• Verify credentials: Double-check the WiFi password, paying attention to:
• Case sensitivity (e.g., "Password" vs "password")
• Special characters that may require keyboard shifts
• Hidden characters that might have been mistyped ^[4]
• Update device software: Outdated operating systems may contain bugs affecting WiFi performance. Check for updates in:
• Android: Settings > System > System update
• iOS: Settings > General > Software Update
• Windows: Settings > Windows Update ^[2][6]

For persistent issues, reset network settings entirely. This returns all network-related configurations to factory defaults:

• Android: Settings > System > Reset options > Reset Wi-Fi, mobile & Bluetooth
• iOS: Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings
• Windows: Settings > Network & internet > Advanced network settings > Network reset ^[3][6]

Router and Network Infrastructure Problems

When multiple devices fail to connect or your device works on other networks, the issue likely stems from your router or internet service. Begin by examining the router's physical status:

• Indicator lights: A solid or blinking power light indicates the router is receiving power. The internet light should be solid (not blinking) to show active connection ^[4]
• Cable connections: Ensure all Ethernet cables are securely connected between the router, modem, and wall outlet ^[7]
• Power cycle: Unplug both router and modem, wait 60 seconds, then reconnect power to the modem first, followed by the router after 2 minutes ^[7][8]

If basic checks don't resolve the issue, investigate these common router problems:

• Channel interference: Neighboring networks using the same channel can cause congestion. Use your router's admin panel (typically accessed via 192.168.1.1 or 192.168.0.1) to:
• Scan for the least congested 2.4GHz or 5GHz channel
• Change to channels 1, 6, or 11 for 2.4GHz (non-overlapping)
• Select 5GHz channels for less interference if your devices support it ^[2]

• DHCP configuration: Routers assign IP addresses automatically via DHCP. If disabled, devices won't receive valid IPs:
• Verify DHCP is enabled in router settings
• Check connected devices are set to "Obtain IP automatically"
• Renew IP addresses on affected devices ^[5]

• Firmware updates: Outdated router firmware may contain security vulnerabilities or compatibility issues:
• Access router admin panel (check manufacturer's guide for default IP)
• Navigate to Administration > Firmware Update
• Download and install any available updates ^[7]

• SSID broadcasting: Some routers may have broadcasting disabled for security:
• Log into router settings
• Navigate to Wireless > Basic Settings
• Ensure "Enable SSID Broadcast" is checked ^[8]

For advanced issues where WiFi isn't appearing at all:

• Factory reset: Press and hold the router's reset button for 10-15 seconds to restore default settings ^[8]
• ISP verification: Contact your internet provider to confirm:
• Active service with no outages
• Correct modem provisioning
• Proper signal levels if using cable/DSL ^[5][9]