Reasons for switching to SMS notification of incoming calls

The reason for calling SMS is that your mobile phone can't be connected or prompted to turn off when the other party calls you. The general reasons are as follows.

bad signal

The signal there is often bad, which makes the mobile phone unable to connect.

Aging of mobile phone card

Your mobile phone card has been used for a long time, and the chip contacts are unstable when it is not used, resulting in the incoming call signal not coming in.

Crowd density

Your location is a place where people are concentrated, which is caused by the peak number of service base stations.

Contact problem of mobile phone card

There is something wrong with the contact between the mobile phone and the mobile phone card. It is suggested that you can gently wipe the contact part of the chip with an eraser to remove the oxide.

Mobile phone problem

If it is not the above reasons, it should be the mobile phone. It is still under warranty for 4 months, so you can check it for free after sale.