As long as the SIM card of the mobile phone is installed in the mobile phone and can be used normally, it does not need to be replaced. There are many user SIM cards, as long as they are used normally for more than ten years.
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Generally, if the SIM card is physically damaged or cannot receive signals, it is necessary to replace the sim card. As long as the mobile phone card with real name authentication, you can directly go to the business hall with your ID card to make up for it.
Generally, it is more appropriate to change it once in three years, and it is not only for safety, but also to prevent the aging of the mobile phone card chip from causing poor contact and unstable signal reception
After the sim is used for a period of time, there will be a large amount of oxidation layer, affecting the contact surface of the mobile phone and the sim card, it is generally recommended to remove once every three months to check and clean up once, and the mobile sim card can be used permanently as long as it is not damaged.
Under normal use, it can be about three years, if you do not often change the phone, it can be 5 to 6 years, in this case, you need to replace it depending on the degree of wear