shahbaz200 :
No, I don't think so any external gyroscope is available. Maybe because its not needed, phones can have it built in plus its size is very small, having it externally makes no sense.
That's not really the issue. Like in my case, I recently purchased a perfectly good phone, but unbeknownst to me it didn't have a gyroscope. I want to play Pokemon GO, but that means I can't use the AR, since it requires gyroscope.
The question is if there is an external device that can be attached to the phone (like a Wii Motion Plus dongle) to permit VR/AR functions.