If you have any sense at all, when you purchase the phone, you
would know how to open. Unless you never tested the phone at all.
Even so, there is something that is called an manual. And being a
lazy ass, I doubt you know there is something like to flip through
the pages and learn how to at least operate a phone.
If you don't even know, if a shame that the phone belongs to
you. I would like 
if I happen to see such a person on a
road. It's like asking people what is alt+clt+del on the street
when you see it after you on your locked pc or lappy...