I read at many places that L640 XL supports OTG but it was not implemented in OS(WP 8.1) and it will be available with Windows 10 mobile. Now when I have received Windows 10 mobile update I am still unable to use it but WM 10 does support OTG.

The Lumia 640 doesn\’t support USB OTG, it\’s a hardware limitation.None of the older phones that came with WP8 or 8.1 support OTG.Only the new 950, XL and some of the newer phones that came preinstalled with Win10 mobile support it.

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