Multifunctional roaming equipment, global roaming system and method

The invention discloses multifunctional roaming equipment consisting of the following modules: a WIFI (Wireless Fidelity) module, a 4G (4-Generation wireless telephone technology) module, a 3G (3-Generation wireless telephone technology) module, and a local SIM (subscriber identity module) card battery module respectively. The multifunctional roaming equipment can realize the enjoyment of local flow rate internet service of other countries around the world during outbound travel, and the domestic telephone number of a user can also enjoy communication services at domestic package service price as normal.