Sales model known & Battery Serial shows as N/A

How can i test the phone is original or fake?

Do you know why 3utools show this type of message?

I learn from several website that the phone parts replacement & Service I can find it on my iphone about option but i can't saw anything in about option how can i understand that the phone is serviced or not?

how can i check it that the phone is serviced or not? i have checked the apple serial number they said the phone valid purchased date and the model is ok

now i want to know that the phone serviced or not or anything changed or not?

any other option to check the iphone originality?

This link said that the phone purchased date is ok & Phone serial is ok?

This is i can understand that the phone is original ?

Ok Thank You