Under normal circumstances, the iPad needs to be loaded with cards, but some arrangements do not support the installation of cards, and can only be used normally by connecting to WiFi. The functions of the iPad are basically the same as that of the mobile phone, but the iPad that can not be installed can only be used in a place where there is a wireless network, and if you leave the wireless network, you can not carry out normal networking, it can not be used normally
No need! It depends on your iPad model! If you buy a WiFi version of the iPad, you can't plug in a card. Unlimited LAN can only be connected through the built-in WiFi antenna. If you buy a cellular iPad, you can insert a phone card. Not only can you connect to WiFi, but you can also connect to the network using mobile cellular data from your phone card.