Its giving error”unable to verify , no internet connection “ in all devices I have

Hello hemantsharma1,

If you're not able to connect to the internet with Wi-Fi on your iPhone, we recommend trying to resolve the issue by following the steps here: If your iPhone or iPad won't connect to a Wi-Fi network - Apple Support

These steps may help:

Make sure that your router is on and that you're within range

Make sure that Wi-Fi is on and that you can see your network

If asked, enter your Wi-Fi password

Check for issues with your Wi-Fi network

Check your cables and connections

Restart

Reset your network settings

For more information on each of those steps, check out the article above.

If you're having a different issue, respond with more detail about what's happening and where you're seeing this message.

Thanks.