Step 1: Check settings & restart
Make sure Wi-Fi is on. Then turn it off and on again to reconnect.
Make sure the Airplane mode is off. Then turn it on and off again to reconnect.
Press your phone's power button for a few seconds. Then, on your screen, tap Restart. If you don't see "Restart," press and hold the power button for about 30 seconds, until your phone restarts.
Step 2: Find the problem type
Phone: Try connecting to the Wi-Fi network with another device, like a laptop computer or a friend's phone. If other devices can use the network, the problem is most likely with your phone.
Network: Check whether your phone can connect to another Wi-Fi network, like at a friend's house or a public network. If your phone can connect elsewhere, the problem is most likely with the network.
Internet: If your phone connects to the Wi-Fi network but you still have no internet, the problem is most likely with your internet connection.