What should I do if I change my new mobile phone SIM card and can't receive the SMS?

Let's talk about the simplest reason first. Check whether the sim card is inserted backwards. If it is inserted backwards, the mobile phone will definitely not be able to read the sim card, so we need to re-insert the sim card in the right way.

Check whether the sim card is damaged.

Change to a normal mobile phone and put the sim card on another normal mobile phone to see if it can be recognized. If other normal mobile phones can't recognize this sim card, it means that this sim card is broken.

Verify whether the mobile phone is broken.

Take a sim card that can be used normally in someone else's mobile phone and put it on the mobile phone that can't recognize the sim card. If the normal sim card cannot be recognized, then some parts of the mobile phone are broken, which may be a hardware problem or a software problem. This needs specific analysis.

Check whether the sim card slot of the mobile phone is loose.

For some people who are engaged in the sales of mobile phone products, it may often be necessary to insert a sim card, which may easily lead to poor contact of the sim card. For this problem, before installing the sim card, we can gently press the metal fixing elastic piece on the sim card, then gently press it after installing the sim card, or move the sim card back and forth. Check whether the sim card slot of the mobile phone is broken. For some sim card slots with poor quality, if the sim card is pulled out frequently, the sim card slot may be broken, so that we can recognize the sim card on a normal mobile phone, and other normal mobile phones cannot be recognized on our mobile phone, so the sim card slot may be really broken and can only be sent for maintenance, and then the reason can be further determined.

Is the sim card oxidized?

Basically all metals will be oxidized, and part of sim is metal. If the mobile phone is soaked in water or the sim card is soaked in water, the sim card may be oxidized, so we need to pull out the sim card, dry it with a hair dryer, and then wipe off the gray oxide on the sim card with a paper towel or towel. Is it because the card is not cut properly and the contact is not good? If so, you can go to the business hall to reissue it, or directly reissue the small card!

For some mobile phones such as iphone, Samsung, HTC, etc., a small card may be needed, and a large card cannot be inserted, so it is necessary to cut the card. If the card is not cut properly, it will also cause poor contact, so we have to go to the business hall to cut the card again or reissue the small card.

For some Android brushing enthusiasts, brushing frequently is to try some new features, styles or functions of rom. Sometimes, some people can't recognize the SIM card after brushing it. In this case, there are two treatment methods:

1. Brush bag that can identify SIM before brushing back.

2. Feedback this problem to the author who made the rom, and ask the rom author to help solve the problem that the SIM card cannot recognize.