How to check if a phone is a refurbished phone?

[acsurfer]

Anyone knows how to check if my note 8 is it a refurbished phone?

I tried the steps in this guide app and dialer code does not work https://android.stackexchange.com/questions/21101/how-to-tell-if-your-phone-is-refurbished

Thanks

 

[DexPhones]

Check for the Build-Quality of the phone, If the phone has cheap quality of casing, Leave it immediately.Check the weight of the phone, Locally refurbished smartphones tend to be lighter than Original ones.Check LTE if the phone supports LTE bands and you have LTE coverage.If the phone is in Excellent condition, Double check it because it may have changed casing.Attach a hands free to the phone and start FM Radio, This is the best way to identif phones with housing of international model.You can open the phone to see if there is not anything wrong going inside
PS: The code does not work for me too and for my friend's phone soo i don't think its a working one