Cell phones cannot be charged.
Alternating current refers to the current that changes periodically in the direction of the current at any time, and the average current in a period is zero. Its direction changes over time, unlike direct current, which does not change periodically.
Usually the alternating current (AC) waveform is a sine curve. Alternating current can transmit power efficiently. But there are actually other waveforms that are used, such as triangular waves and square waves. The mains electricity used in life is the alternating current with sinusoidal waveform.
There is an AC socket with a charging phone interface, plug in the data cable can charge the phone.