Yes, you can still use the wireless Internet when your cell phone is free of charge. The mobile phone number card is only related to the data network, and the wireless WIFI is not related, even if you take the mobile phone number card out of the mobile phone, you can use the wireless WIFI to surf the Internet. However, you should pay attention to your mobile phone number card without phone charges, if the mobile phone number card is stopped for more than three months, the operator will force to cancel your mobile phone number card.