Ask HN: I bought Voltaren at the chemist, now Google shows me ads for it. Why?
Opt out of VISA marketinghttps://marketingreportoptout.visa.com/OPTOUT/request.doSecond, disable GPS, and cellphone tower ID reporting (root needed.) So Google can't correlate you with sales records.At the moment, there is no way to disable Google AGPS spying on the stock Android.Third, block Google apps from reading your IMEI/IMSI/serial number, so they can't get AGPS data from your cellphone provider if it sells it.Better, get a de-Googled ROM