Tablets that also have a cellular – or 4G – data connection have a built-in SIM like your smartphone, and as such are able to get online anywhere you have network coverage. You'll be able to get online when you want, and not when public Wi-Fi allows. What can I do with a 4G tablet? With a 4G tablet you have an internet connection anytime and anywhere and you are no longer dependent on WiFi. Place a SIM card with a mobile data connection in the tablet and check your route on Google Maps or update your mail.