I got a social security card in my hometown of Nanchong, and now I work in Chengdu. Which social security card is useful?

According to relevant information, it is useful. First of all, when you arrive in a different place, your former work unit will handle the formalities of stopping paying social security for you. After the suspension, your social security card may not be used normally. If you don't suspend classes, you can make it up in two months, but you can't make it up in three months. The money originally credited to your personal medical insurance account can be transferred to your new workplace, which requires the consent of the social security bureau of the workplace, and the personal medical insurance card account will not be transferred to a frozen state. It is best to go to the local official website to check the first-hand authoritative information.