That depends on what threat scenario you're looking at. If your government wants to track you, they'll find a way, regardless of what phone you're using (or not).
But the privacy gains of not installing a load of third-party apps from a dozen different data-selling businesses (or using an operating system built by the mother of all data-selling businesses) are very substantial.
But the privacy gains of not installing a load of third-party apps from a dozen different data-selling businesses (or using an operating system built by the mother of all data-selling businesses) are very substantial.