Make sure your mobile data connection is turned on. To do this, select Settings > Network & wireless > Mobile & SIM > mobile connection name > Data connection .

Go to Settings > Network & wireless > Flight mode and make sure flight mode is turned off.

Make sure WiFi is turned on in Settings > Network & wireless > WiFi . If a network you expect to see appears in the list, select the network, then select Connect .

If you're at home and expect to see your WiFi network but don't, restart your WiFi router. This should be a last resort.