Originally Posted by user822
I recently aquired a used Z1 and wanted to check if it is indeed only "1 Month old".
Is there a possibility to check this? Somewhere in the firmware or with a serial# etc?
Look for this Number at the back side somewhere in smallish letters:-
Inside the micro sd card slot will be a sliding sticker. use your long nails or a pointed screwdriver whatever, to pull it out
14W15 (as an example) that will be 2014 week 15