January 19, 2021

Are USB-2.0 phones compatible with USB-3.0 chargers?

Impossible to answer.  No way to know whether the USB 3.0 charger is designed so that it is backwards compatible with a USB 2.0 device.  So or, some or not.

A USB 2.0 phone can not use a USB 3.0 charger in its native format.  But many 3.0 chargers are designed so that they can detect a 2.0 device and work as if they are a 2.0 charger.

No way to predict if that charger you have is designed to do that.

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