Make sure that your router is on and you're within range If you're too far from your Wi-Fi router, you can't get a signal, so make sure that you're within range.
Make sure that Wi-Fi is on and you can see your network Go to Settings > Wi-Fi and make sure that Wi-Fi is on. Tap the name of your Wi-Fi network to join. A blue checkmark beside a network name means that you're connected. If you see Auto Join Disabled under your Wi-Fi network name, tap it turn on Auto-Join.
Check for issues with your Wi-Fi network If iOS detects an issue with your Wi-Fi connection, you might see a Wi-Fi recommendation under the name of the Wi-Fi network that you're connected to. For example, you might see the alert "No Internet Connection." To get more information, tap the Wi-Fi network.
Still can't associate? Reset your Network Settings. Tap Settings > General > Reset > Reset Network Settings. This likewise resets Wi-Fi organizations and passwords, cell settings, and VPN and APN settings that you've utilized previously.