I just went abroad to work. I have two cards, domestic and foreign. Domestic GSM roaming can be used normally. How to switch telephone, SMS and Internet access for foreign cards?

Before studying abroad, it is generally necessary to do a lot of adequate preparation for studying abroad in order to be foolproof. As a reminder before studying abroad, students are advised to fully understand all available resources around them before going abroad, so as to solve problems in study, life, psychology, health, laws and regulations, safety and so on in time. For example: whether it is Europe, America or Japan; Teeth and eyes (except France) are not covered by medical insurance. In foreign countries, the treatment fees of these two subjects are very expensive; Therefore, it is suggested that students should do dental treatment in advance and wear more glasses before going abroad.