Mobile phones charge at different outlets at different speeds, mainly due to the voltage and current of the outlet. The voltage and current of the outlet will affect the charging speed of the phone, if the voltage and current of the outlet are low, then the phone will take longer to charge. In addition, the charging speed of mobile phones is also affected by factors such as the power of the charger and the quality of the cable. Therefore, in order to ensure the charging speed of the mobile phone, we should choose the appropriate socket, charger and cable to charge.