As soon as you insert 3G/4G & LTE mini PCIe modules, this Base HAT becomes a bridge between Raspberry Pi and the 3G or 4G wireless modem. $39!

This cellular HAT provides simplified data connection for remote IoT projects, on the field, across the globe, everywhere. Start using a high-speed LTE connection with low power consumption in a slim form factor with all necessary software for Raspberry Pi.

You will definitely need to get a miniPCIe module to make it work.