Google Analytics Mobile Device Mapping Accuracy

I created seperate profile for Mobile WAP Site. Google Analytics shows 26% of the traffic from Desktop Version, When analyzing the 26% Google Analytics Mobile Device Accuracyof the traffic data with Browser, 95% of the browser are mobile Compatabile browser (like Opera Mini, Mozilla compatabile agent, Safari, etc). Inference: Google Analytics unable to make 20 to 25% devices. This may be due to the mobile may be belong to local brand that does not adhere global standards.