Why does iPhone 6 remind facetime to activate SMS charging?

1 Use mobile phone traffic or WiFi network when sending and receiving iMessage. If the mobile phone does not open traffic packets, use iMessage to send and receive messages.

Power saving method

1. The way to close "Set Time Zone" is to open Settings → Location Services → System Services → Set Time Zone, and click Close. Once the function of setting time zone is turned off, the battery life can be increased by up to 40%.

2. The method to turn off the automatic time setting is: turn on Settings → General → Date and Time, and turn off the automatic setting. Otherwise, the mobile phone terminal will always search the current location, and then automatically adjust the time according to the different locations.

3. The way to turn off the system service is: turn on Settings → Privacy → Location Service → System Service (at the bottom) in turn, and turn off all except the last compass calibration, because they are all useless things.