Why does it take 40 seconds to receive text messages in your pocket when your mobile phone is black?

The reason why my mobile phone received a message in my pocket after 40 seconds of black screen was because the mobile phone was in power-saving mode, the signal of the mobile phone was not good and the memory of the mobile phone was insufficient.

1. When the phone is in power saving mode, the network connection will be turned off to save power. When a new short message arrives, it needs to reconnect to the network to receive it.

2. The mobile phone signal is not good, which leads to the delayed arrival of the short message.

3. The lack of memory in the mobile phone causes the system to run slowly, and the speed of receiving short messages will also be affected.