How to adjust the time of calf's phone watch?

"The time of the phone watch is synchronized according to the network and cannot be set manually. If the time is out of sync, you can check whether the mobile phone card is in arrears, which makes the watch unable to connect to the network. If there is a "G" icon on the top of the watch, it means that the watch can be connected to the network. If not, it means that the watch cannot connect to the network. If there is something wrong with the watch itself, you can use the reset button to restore it. Operation method: Press the power button 8 "on the back of the watch with the corner length of the card reader.