I think, that it&#x27;s not that anonymous.<p>Weak spots:<p>1. I wouldn&#x27;t recommend buying used devices, you don&#x27;t know what has been done with the device, what&#x27;s running there, even if you reflash it from scratch. Try to buy somehow (anonymously) device in still original and sealed packaging.<p>2. One would need to first install modified AOSP&#x2F;CyanogenMod with patched core libraries&#x2F;apps&#x2F;services to return fake&#x2F;random values for device serial number, WiFi and Bluetooth MAC addresses. Otherwise some of the apps might leak this information over the air, even in clear text form.<p>3. You need to remove or somehow power off the GSM baseband, otherwise you can still be tracked.<p>I&#x27;m not an expert in this area, so there might be a lot other missing weak spots in this guide.