Security researcher Christopher Moore published a blog post on his website detailing the data collection practice by the Chinese smartphone maker. He found that the data collected by the company included: User’ phone number, mobile network(s) names and wireless network ESSID and BSSID. There’s no direct option available to disable this telemetry tracking behaviour. The same issue was also publicly reported to OnePlus in July last year by another security researcher and software engineer, who goes by the online moniker “Tux,” but the problem got ignored by others.
Source: https://thehackernews.com/2017/10/oneplus-oxygenos-analytics-data.html