1. Different versions.
The card is also called the Cellular version, which uses cellular network technology to access the Internet. The wifi version is also called the WIFI version, which uses WIFI wireless network technology to surf the Internet.
2. Different technical principles.
3. Different characteristics.
The card is to catch the SIM card, you can access the Internet anytime and anywhere, without regional restrictions. However, it consumes network card traffic. The wifi version allows you to access the network only if there is a WIFI signal.