cannot get on broadband other devices ok

Go to Settings > Wi-Fi > Select your network from the list > Tap it then hit Forget.

Check That your mobile operator is listed

Ensure that you're at a location with Mobile Broadband/ Home Wireless Broadband coverage. You can check coverage at your address .You must be in a 4G Plus or 3G dual band coverage area to access the Mobile Broadband network.

Ensure that your Mobile Broadband/ Home Wireless Broadband SIM card is activated

On some devices having Wi-Fi and/ or Bluetooth activated can override a successful 'Cellular' connection to the internet.

If you're able to, switch Wi-Fi and Bluetooth off on your computer/ tablet and try to access the internet via your Mobile Broadband /Home Wireless Broadband service.

If you’ve tried all of the above and you still can’t connect to Wi-Fi, then further investigation is needed.