I'm trying to programmatically find my phone's first activation / unboxing / last factory reset date. I know that there isn't an API for that, but I tried a few things:
1) PackageInfo.firstInstallTime()
for a system package
2) BUILD.Time
3) new File("/proc/cpuinfo").lastModified()
But none of them gave the exact true date. Any ideas ?
Thanks in advance.