What happened when the mobile phone card suddenly stopped working?

If the SIM card icon is not recognized in the status bar above the mobile phone, or two SIM cards are inserted, only the 1 signal icon is displayed, indicating that your SIM card cannot be recognized. Please solve the SIM card problem as follows:

1. Please restart your phone and try again.

I suggest you restart your phone, let it re-read the "SIM card" and try again.

2. Please observe whether the SIM card looks good.

(1) Observe whether there is dirt on the metal surface of the SIM card, and clean the dirt on the surface of the SIM card to prevent the SIM card from being unrecognizable due to poor contact.

(2) If you cut the SIM card yourself, it is probably because the shape of the SIM card is not standard and it is loosely installed in Catone, which leads to unrecognizable and poor contact. It is recommended that you bring your ID card to the nearest operator's business hall to replace the standard SIM card.

Please test whether the SIM card can be used normally.

If your SIM card can't be recognized on other mobile phones, or other SIM cards can be recognized on your mobile phone, it is very likely that your SIM card is broken. It is recommended that you bring your ID card to the nearest operator's business hall to replace the standard SIM card.

4. Please check whether the SIM card is put in the corresponding card slot.

Some mobile phones only support a single SIM card. There is a NM card slot on one side of Caton and a SIM card slot on the outside. Please refer to the logo on the Cato frame to place the card. The misaligNMent between SIM card and nm card will lead to unrecognizable.

If this problem is still not solved by trying the above methods, please back up the data in advance (third-party applications such as QQ and WeChat need to be backed up separately), and bring relevant purchase vouchers to the nearby Huawei customer service center for testing.

Related links are as follows: Huawei Customer Service Center makes an appointment for service delivery service maintenance spare parts price inquiry.