Restarting the device might help you resolve any software issues that are preventing you from connecting to the Internet. Press and hold the Power (Sleep/Wake) button until the red slider appears to reset your device. To totally turn off your iPhone, drag the slider. Press and hold the Power button for a few seconds until the Apple logo shows.
Check your Wi-Fi settings.
Make that Wi-Fi is turned on and that your wireless network can be seen. Go to your phone to accomplish this. Wi-Fi may be found in the Settings menu. If required, toggle the Wi-Fi switch to enable the capability. To connect to a Wi-Fi network, touch the name of the network you wish to connect to. If you're required for a network passcode, type in the right Wi-Fi password to continue. You're already connected if you see the blue checkmark next to the network name.
