Need to check settings on my iPhone.can't access the internet, error?

Need to check settings on my iPhone.can't access the internet, error?

If you're using carrier's internet (your SIM card's internet and not Wi-Fi)
Go to settings > Cellular > Cellular data
If the APN form is empty google your carrier's apn or call hotline and type it into the apn form
Wait a minute or two and you should have internet.

Restart your phone.

Check if Wi-Fi is on, then check if you need to re do the network password to connect