From everything I read on the issue, it looks like Nokia had lots of problems implementing the usb interface and preferred to sacrifice USB OTG and stick to the two use cases they originally thought (usb charging and usb slave mode).
Kutoka kila kitu mimi kusoma juu ya suala, inaonekana kama Nokia alikuwa na kura ya matatizo ya utekelezaji wa interface USB na preferred sadaka USB OTG na fimbo na kesi ya matumizi wawili wao awali walidhani (USB kumshutumu na USB mode mtumwa).