Meizu MX4 PRO mobile phone can only recognize the SIM card after inserting the card or flying for a long time, and then it can access the mobile network and send short messages.

The phone can't recognize the SIM card. Treatment method:

First of all, please confirm whether the SIM card type is correct according to the mobile phone model. Incorrect SIM card may damage the card holder and card slot, or even cannot be taken out;

Second, please make sure to use the standard SIM card. Please do not use a non-standard SIM card or cut the card yourself. Cutting the card is easy to cause the SIM card to fail to recognize or damage the mobile phone. It is recommended to replace the original standard SIM card in the business hall.

3. Please confirm whether the card is placed correctly. Whether the gap of SIM card corresponds to the card slot;

4. Please confirm whether the surface of SIM card is dirty. If the SIM card is used for a long time, you can wipe the surface of the chip with alcohol or replace the original standard SIM card in the business hall. SIM card is used for a long time, and the metal surface is easy to be oxidized, which easily leads to the probability of not knowing the card;

5. Please don't insert or pull out the SIM card when it is turned on. Please restart the phone after inserting the SIM card.

6. If the problem still exists, please back up the information in advance and take the purchase invoice to the after-sales service point for maintenance.