When phone is hooked up to wifi dose it charge Internet usage on your phone plan?

When your phone is connected to Wi-Fi, it typically does not count against your mobile data usage on your phone plan. Instead, the device uses the Wi-Fi network to access the internet, which is separate from your cellular data. However, any activities that require cellular data while not connected to Wi-Fi will still count against your plan. Be sure to check your settings to ensure you're connected to Wi-Fi when you want to avoid using mobile data.