- First of all, get a USB OTG -cable. They can be found everywhere. Here is one: https://www.verkkokauppa.com/fi/catalog/7744d/USB-OTG for 6,90 € (in Helsinki, Finland).
- Next, find out if your Android phone supports OTG (On The Go). Download and install USB OTG Checker from Play Store. Check your phone to see if USB OTG support exists.
- After the above steps it's time to connect your phone with another phone. Use the USB OTG -cable and your normal USB charging cable. Thumbs up your friend's phone will be charged! And hey, not only phone-phone can be connected but phone-other devices as well (cameras etc).
Charging going on!
Samsung Galaxy S receiving extra power!
USB OTG Checker