Cellular module is a plug and play module designed for smart meters. The module can support 2G network, 3G network or 4G network separately by different module and can also support 2G/3G/4G networks at the same time, and register specific networks according to on-site network. It is a powerful wireless communication device. The module has rich functions, supports various communication modes, supports SMS sending and receiving functions. The module has high communication speed and supports remote upgrades.