What can I do when my phone displays a pop up warning of “high temperature”?

The warning is the normal consequence of the CPU handling excessive data, which makes the battery warm. It is a recommendation message and not harmful to the battery or phone even if the phone feels hot.

You can follow the actions below to make your phone return to its normal temperature:

1) It is suggested not to expose your phone in sunshine for a long period of time;

2) Close large power consumption applications, such as music, chatting applications, GPS application, 3D gaming, video streaming etc.;

3) Reduce the brightness of the screen to lower the temperature.