open dialer, type *#12580*369# A dialogue box opens up... look for "RF Cal" option There u can find the date of purchase in the format YYYYMMDD (year,month,date)
if u have factor reset ur phone in recent times then it shows manufactured date.
There is another lengthy way... provided u added google account on ur mobile on the date of purchase:- 1.Open google app on ur phone (not chrome browser, google application) 2.click on ur profile image on the top right corner 3.click on manage account tab 4.slide to the security tab and scroll down till u find "your devices" 5.there u can see "manage ur devices" highlighted in blue... click it 6. at the desired device click on the more details tab, also highlighted in blue 7. there u can see first sign in date
