Reverse charging feature which lets you charge other phones through the bundled USB OTG cable .It means that you can charge other phone using phone's reverse charging feature. USB reverse charging simply means that your device can act as power bank and can be used to charge other devices.
Keeping this in view, do all phones support OTG?
The bad news is that not all devices come with the necessary hardware and drivers for this USB On-The-Go (OTG) capability. The fastest and most effective solution by far is to install USB OTG Checker, a free app that quickly and effectively determines whether your Android phone or tablet supports USB OTG.
What is OTG connection in mobile?
OTG(On The Go) is a standard that enables mobile devices to talk to one another. Traditionally mobile devices could only connect to a Mac/PC by USB, but USB OTG makes it possible for devices to connect directly to each other.